WO1997019322A1 - Locating positions on maps - Google Patents
Locating positions on maps Download PDFInfo
- Publication number
- WO1997019322A1 WO1997019322A1 PCT/GB1996/002849 GB9602849W WO9719322A1 WO 1997019322 A1 WO1997019322 A1 WO 1997019322A1 GB 9602849 W GB9602849 W GB 9602849W WO 9719322 A1 WO9719322 A1 WO 9719322A1
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- WIPO (PCT)
- Prior art keywords
- map
- ordinate system
- maps
- area
- wide
- Prior art date
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/20—Instruments for performing navigational calculations
- G01C21/22—Plotting boards
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B29/00—Maps; Plans; Charts; Diagrams, e.g. route diagram
- G09B29/10—Map spot or coordinate position indicators; Map reading aids
- G09B29/106—Map spot or coordinate position indicators; Map reading aids using electronic means
Definitions
- Locating Positions on Maps This invention relates to the location of positions on maps.
- WO-A-87/07013 is marketed by Yeoman Marine Limited, of Lymington, Hampshire, United Kingdom, under the name “Navigator's Yeoman”. Also, an accessory is available for the Silva GPS compass, called the “Silva Yeoman Navimap", which has a similar effect.
- a digitising table on which a traditional map can be placed uses (a) a digitising table on which a traditional map can be placed, (b) a cursor which is movable across the map on the table and has indicators to indicate a required direction of movement, (c) a GPS receiver (or an input to receive a signal from a separate GPS receiver) from which one's current position can be determined, and (d) a processor which deterrnines, from the cursor position on the digitising table and the current GPS position, which way the cursor should be moved so that it is over the current position and activates the indicator lights on the cursor accordingly.
- the map must be manually referenced with respect to the digitising table so that the processor can translate between the latitude and longitude co-ordinates obtained from the GPS receiver and the co-ordinates of the digitiser table. Referencing can be performed by placing the cursor at two (and preferably three) positions on the chart, and at each position instructing the processor with the latitude and longitude co-ordinates of that position.
- referencing can be carried out by registering the cursor on the current known position on map and then indicating to the apparatus the north direction of the map and its scale.
- a digitising table which is as large as the map, or at least as large as a folded portion of the map which is to be viewed at one time without re-referencing.
- Skyforce Avionics Limited of Ramsgate, Kent, United Kingdom which is primarily designed for aircraft navigation, a representation of the map is held in computer memory.
- the current position is determined using a GPS receiver, and a relevant part of the map, together with the current position, is displayed on a Uquid crystal graphic display.
- the disadvantages of this sort of system are that (a) it would be extremely expensive if a large, high-resolution, map and colour display were to be used; and (b) many people prefer to use a traditional map.
- the SkyMap system also has the ability to display the full OSGB grid co-ordinates of the current position so that the position can be located on an OSGB map.
- OSGB maps are not indexed according to the grid references covered, only according to sheet numbers, and the sheet numbers depend on the scale and series of the maps. Therefore it is not straightforward to select the appropriate map. Also, for a resolution of 100m, the full eight digit (or two letter and six digit) OSGB grid reference is not needed and not normally used when referring to a particular 1 :50,000 sheet, and therefore providing all eight digits can lead to unnecessary confusion.
- the present invention is concerned with dealing with the problems mentioned above of the known systems.
- Traffic map means a map which is printed on paper, linen, plastics sheet or the like
- Map co-ordinate system means a system of co-ordinates which are normally used to define a position on a particular map, and differs from a "Wide-area co-ordinate system” which includes the longitude and latitude system for defining positioas on the earth's surface, but also includes other co-ordinate systems.
- the co ⁇ ordinates (312, 815) are co-ordinates according to the map co-ordinate system for that map, and differ not only from the co-ordinates (51.5164°N, -0.1095 ⁇ ) according to the longitude and latitude co-ordinate system but also from the full OSGB co-ordinates (5312, 1815) or (TQ, 312, 815) according to the complete wide-area OSGB co-ordinate system; and "Wide-area position transmitting system" means a system which transmits signals which can be received over a large area and which can be processed so as to determine the receiver's position in terms of a wide-area co-ordinate system.
- GPS Global System
- a wide-area position transmitting system is "GPS", which is operated by the US Department of Defense and comprises a couple of dozen or so transmitters which orbit the earth and transmit signals.
- the signals from three or more transmitters are being received at a single site, they can be processed so as to determine ihe position of that site in terms of longitude and latitude.
- the term "wide-area position transmitting system” is intended to include not only other satellite positioning systems, but also terrestrial positioning systems which rely on transmissions from land-based transmitters, and from which one's position in terms of a wide-area co-ordinate system can be determined.
- First and second aspects of the invention are concerned in particular with a position locating apparatus, for use with a traditional map having its own co-ordinate system distinct from a wide-area co-ordinate system and for use with conversion data associated with the map (e.g. in the form of a bar code, magnetic stripe, smart card or encoded text) from which the relationship between the map co-ordinate system and the wide-area co-ordinate system can be determined, the apparatus comprising: means for receiving the conversion data; means for receiving transmissions from a wide-area position transmitting system and deterschoolning therefrom the current position of the transmission receiving means in terms of the wide-area co-ordinate system; means for processing the current wide-area co-ordinate position and the conversion data to determine the current position in terms of the map co-ordinate system; and means (e.g.
- the first aspect of the invention is characterised in that: the processing means is operable to determine the current map co-ordinate position as a coarse position relative to the map and a fine position relative to the coarse position; and the annunciating means comprises means for annunciating the coarse position and means for annunciating the fine position.
- This aspect of the invention therefore provides the advantage that a form of annunciation which is suitable for coarse positioning can be used for that purpose, and another form of annunciation which is suitable for fine positioning can be used for that purpose.
- the coarse position annunciating means is preferably operable to annunciate an identity of that one of die blocks containing the current position, as in the above example "Block M 42".
- each block could, for example, be notionally divided in ten in each of the x and y directions, and the location of the old Patent Office building could be annunciated as "Page 62, Block M 42, Position (1, 7)".
- this may cause confusion, for example as to whether it means 1/10 along and 7/10 up, or 1/10 up and 7/10 along.
- the fine position annunciating means preferably comprises a graphical display and means for activating the display to display the fine position relative to a datum point.
- the display comprises a see-through display which can be registered over the identified block on the map and which is operated to indicate the current position within that block. Accordingly, the display need only be as large as a block on the map, and need not be as large as the whole map.
- the apparatus may be used with such conversion data from which the area covered by the map can be determined, and in this case the processing means is preferably operable to determine whether the current position is covered by the map. In this way, invalid or inappropriate annunciations, which might confuse the user, can be avoided.
- the apparatus may be used with a series of such maps and with such conversion data from which the relationship between the co-ordinate system(s) of the maps and the wide-area co-ordinate system can be determined and the area covered by each map can be determined.
- the processing means is operable to determine (a) the identity of that map, or at least one of those maps, which cover the current position, and (b) the current position on that map in terms of the co-ordinate system of that map; and the annunciating means is operable to annunciate to the user (a) the identity of that map and (b) the current position in terms of the co-ordinate system of that map.
- the user can be assisted in selecting the appropriate map.
- the data for all two hundred and four sheets in the series may be stored, and in the case of the position mentioned above, the annunciation may be in the form "Sheet 176, grid block (31, 81)."
- the second aspect of the invention is characterised in that: the apparatus is for use with a series of such maps and for use with such conversion data from which the relationship between the co-ordinate system(s) of the maps and the wide-area co-ordinate system can be determined and the area covered by each map can be determined; the processing means is operable to determine (a) the identity of that map, or at least one of those maps, which cover the current position, and (b) the current position on that map in terms of the co-ordinate system of that map; and the annunciating means is operable to annunciate to the user (a) the identity of that map and (b) the current position in terms of the co-ordinate position of that map.
- the apparatus may be used with such maps having some portions which overlap, and in this case preferably the processing means is operable, in the case of a position falling on more than one of the maps, to determine (a) the identity of two or more of the maps which cover the current position, and (b) me current position(s) on those maps in terms of the co-ordinate system(s) of those maps; and the annunciating means is operable to annunciate to the user (a) the identities of those maps and (b) each current position in terms of the co-ordinate system of the respective map.
- the apparatus does not force the user to turn a page when that may not be necessary.
- the apparatus may be used with such maps which are not all to the same scale and with such conversion data which takes into account the different scales of the maps, and in this case preferably the processing means is operable to take into account the scale of the maps in determining the current position in terms of the map co-ordinate system(s).
- the Geographers' A-Z Master Atlas of Greater London, Edition 4(B) has a first set of maps on pages 2 to 160 covering Greater London to a scale of 3" to 1 mile (1:21,120), a second set of maps on pages 162 to 183 covering central London to a larger scale of 9" to 1 mile (1 :7,040) and a third set of maps covering London and its environs to a smaller scale of 214 miles to 1 " (1:158,400).
- the apparatus may be used with such conversion data from which the relationship between the map co-ordinate system and at least one datum point of the medium on which the map is formed can be determined, and in this case one embodiment of the apparatus further includes: a digitising surface having its own co-ordinate system; means for referencmg the map with respect to the digitising surface; a cursor which is movable with respect to the referenced map and the digitising surface; means for determining the position of the cursor with respect to the digitising surface in terms of the digitising surface's co-ordinate system; means for processing the current wide-area co-ordinate position and the conversion data to determine the current position in terms of the digitising surface's co-ordinate system and/or for processing the cursor position and the conversion data to determine the cursor position in terms of the wide-area co-ordinate system; and means for annunciating to a user the current position in terms of the digitising surface co-ordinate system and/or the cursor position in terms of the wide-area co-ordinate system; wherein the
- a third aspect of the present invention is concerned with a position locating apparatus, for use with a traditional map having its own co-ordinate system distinct from a wide-area co-ordinate system and for use with conversion data associated with the map from which the relationship between the map co-ordinate system and the wide-area co-ordinate system can be deteirnined, the apparatus comprising: a digitising surface having its own co-ordinate system; means for referencing the map with respect to the digitising surface; a cursor which is movable with respect to the referenced map and the digitising surface; means for dete ⁇ nining the position of the cursor with respect to the digitising surface in terms of the digitising surface's co-ordinate system; means for receiving the conversion data; means for receiving transmissions from a wide-area position transmitting system and determining therefrom the current position of the transmission receiving means in terms of the wide-area co-ordinate system;
- the third aspect of the invention is characterised in that: the apparatus is for use with such conversion data from which the relationship between the map co-ordinate system and at least one datum point of the medium on which the map is formed can be determined; and the referencmg means comprises means for registering the or each datum point of the map medium with respect to the digitising surface.
- the annunciating means is operable to annunciate the current position by indicating a required direction of movement of the cursor towards that position.
- storing means is provided for storing a target position; the processing means is also operable to calculate the distance between the stored position and the current position and/or the bearing of the stored and current positions relative to each other; and the annunciating means is also operable to annunciate the calculated distance and/or bearing.
- a fourth aspect of the present invention is concerned with a map having: its own co-ordinate system distinct from a wide-area co-ordinate system; and conversion data associated therewith from which the relationship between the co-ordinate system of the map and a wide-area co-ordinate system can be determined.
- a map is known from WO-A-95/22742.
- the fourth aspect of the invention is characterised in that: the map is one of a series of such maps; and the conversion data is collectively provided for all of the maps in the series. Accordingly the maps can be used in a system which can indicate to the user which of the maps to use.
- the area covered by each map can be determined from the conversion data. Some portions of the maps may overlap. Not all of the maps need be to the same scale, and in this case the conversion data preferably takes into account the different scales of the maps.
- the maps in the series may be bound together in the form of an atlas. When used with the apparatus described above, the apparatus can then tell the user to which page of the atlas to turn, and where on that page to look.
- the conversion data may be provided on or in the maps or atlas, for example in the form of a bar code or magnetic stripe printed on the map or inside cover of the atlas, or a smart card forming an additional page to the atlas, or which is removably inserted in a pocket or the like on the map or in the atlas.
- the conversion data includes at least one parameter related to the cartographic projection(s) of the maps, so that the system can accurately locate positions on maps employing different cartographic projections.
- the conversion data is machine-readable, and the data receiving means of the apparatus may then comprise means for reading the machine-readable data.
- the conversion data may be provided as user- readable encoded text, and the data receiving means of the apparatus may then comprise means (such as a keypad) to enable a user to enter the encoded text and means for decoding the entered text.
- a fifth aspect of the present invention provides a position locating system, comprising: an apparatus according to any of the first to third aspects of the invention; a traditional map having its own co-ordinate system distinct from a wide-area co-ordinate system; and conversion data associated with the map from which the relationship between the map co-ordinate system and the wide-area co-ordinate system can be determined.
- a sixth aspect of the present invention provides a position locating system, comprising: an apparatus according to any of the first to third aspects of the invention; and a series of maps and associated data according to the fourth aspect of the invention.
- the display is preferably substantially smaller in area than the or each map.
- a data carrier per se associated with a series of maps and containing data from which the relationship between the co-ordinate system(s) of the map and the wide-area co-ordinate system can be determined, the data being machine- readable or being encoded user-readable text.
- the user instead of (or in addition to) being presented with the latitude and longitude co-ordinates (51 °30'59"N, -0°06'34"E), the user might instead be presented with the abbreviated OSGB grid block for the position on Sheet 176, i.e. "(31, 81)” or with the abbreviated higher resolution grid reference "(312, 815)”; and (6) referencing is carried out simply by entering the data associated with the map.
- Figures 1-3 show portions of pages 62, 173 and 186, respectively, of the Master Atlas of Greater London, Edition 4(B), published by Geographers' A-Z Map Company Limited, Sevenoaks, Kent;
- Figure 4 is a block diagram showing functional elements of one embodiment of apparatus for use in performing the invention.
- Figure 5 is top view of the apparatus of Figure 4.
- Figure 6 is a top view of another embodiment of the apparatus.
- ⁇ and ⁇ denote the wide area co-ordinates of a position on the surface of the earth in terms of longitude ( ⁇ ) and latitude ( ⁇ ) with the sign convention that east of the Greenwich meridian is positive and north of the equator is positive;
- x and y denote coordinates (in the usual directions) of a position on a map in terms of the map's own co-ordinate system.
- the elements a and d relate predominantly to the scale of the map in the x and y directions
- the elements e and f relate predominantly to the position of the map
- the elements b and c account for any skew between the x direction of the map and the lines of latitude.
- the invention When the invention is applied to a single map, it is preferable that a determination is made as to whether the current position is within the boundary of the map, so as to avoid attempting to calculate and annunciate map co-ordinates which are not covered by the map. Also, when the invention is applied to a series of maps, it is preferable that a determination is made as to whether the current position is within the boundary of any of the maps, and if so which one(s). Due to the nature of the longitude and latitude wide-area co-ordinate system, relatively few maps have boundaries which extend along lines of constant longitude or constant latitude. It would be possible to develop a formula defining each boundary line in terms of both longitude and latitude.
- the mapped region of some maps is not a simple rectangle or square.
- maps often have a small legend rectangle at one comer.
- the mapped area can be divided up into, say, two rectangular sub-maps, each having the same conversion matrix, but with different values of x L , x R , y ⁇ and y B .
- the co-ordinates of the grid lines on most OSGB sheets, in each of the x and y directions consist in full of a three digit number, e.g. the old Patent Office site mentioned above is in OSGB grid block (s31 , 181), but the most significant digits are not normally used and are usually marked only at the comers of the map.
- the y co-ordinates of the map blocks are numerical but increasing in the downwards direction, as seen in Figure 1, and the x co-ordinates are alphabetical with repeats, but the same letter is never repeated on two adjacent pages of the atlas.
- the x co-ordinates of the map blocks are alphabetical, but re-starting at "A" on each double page.
- the third set of maps are marked with OSGB grid lines at 10 km intervals.
- all map co-ordinates (x, y) are stored and processed numerically until they are displayed, when they are converted into their proper form (X, Y) in dependence upon co-ordinate style codes Sj and S y for the map or set of maps in question.
- the data which is provided may comprise: a "single map" flag set at 1 indicating that the data relates to a single map; the six values a to f of the conversion matrix; the four values x L , x R , y ⁇ and y B defining the map's boundaries; two codes S-, S y representing the x and y co-ordinate styles of the map; and the name of the map.
- the data might consist of: 111.47994; 2.574881 ; -3.2092944; 111.23796; 704.10065; -5548.9032; 495; 535; 160; 200; S x ; S y ; "OSGB Landranger Series 2 Sheet 176"
- the eleven data items may be printed in the form of a bar code or magnetic stripe on the map.
- the data which is provided may comprise :- the single map flag, but set to 0 indicating that the data relates to more than one map; the name of the series of maps or the atlas (e.g. "A-Z Master Atlas Greater London”); the number S of sets of maps in the series or atlas (e.g. "3");
- the apparatus 10 is portable, of so-called "palm-top” size, and comprises a casing 12 having a GPS antenna 14 mounted on its top edge and a slot 16 providing access to a smart card reader 18 in its bottom edge.
- the smart card may form part of a special page of an atlas, or may be removably inserted in a pocket inside the cover of the atlas.
- the smart card which is insertable into the slot 16 may be a completely separate article, for example containing the data of all 204 sheets in the OSGB Landranger Second Series.
- the top face of the casing 12 has: an on/off switch 20; a mode switch 22 having standby, display and setup positions; a liquid crystal text display 24; and a liquid crystal graphical display 26. Altematively, these two displays could be combined into one.
- the graphical display 24 comprises an 11 x 11 array of pixels, any one 38 of which can be activated to display a position within a grid block.
- the casing also contains: a microprocessor unit 28; a GPS receiver 30; ROM 32; RAM 34; and a battery 36.
- An extemal power socket may also be provided to receive power from a mains adaptor to charge the battery or from a vehicle's cigar lighter socket.
- the MPU 28 When the on/off switch 20 is "on”, the MPU 28 operates in accordance with a program stored in the ROM 32.
- the mode switch 22 When the mode switch 22 is at "setup”, the smart card reader 18 is activated, and it can read the data mentioned above associated with the map, series of maps or atlas, and supply it to the MPU 28 for processing and storage in the RAM 34.
- the GPS receiver 30 is connected to the GPS antenna 14, and when the mode switch 22 is at "display”, the GPS receiver 30 is activated, and when it receives signals from three or more GPS satellites it supplies the current wide-area co-ordinates ( ⁇ , ⁇ ) to the MPU.
- the mode switch 22 When the mode switch 22 is at "display” or “semp”, the LCDs 24, 26 are activated.
- the mode switch 22 When the mode switch 22 is at "standby”, the smart-card reader 18, GPS receiver 30 and LCDs 24, 26 are inactive, but the data which has been read continues to be stored in the RAM 34.
- the program stored in the ROM 32 causes the apparatus to operate according to the following routines of steps while the on off switch is "on":-
- R8 Store the wide-area co-ordinates ( ⁇ , ⁇ ) from the GPS receiver 30 the RAM 34
- M4 • • If, from Formulae 7 and 8 and the stored data, it is determined that the current position is not covered by that map m in that set s, jump to step M10.
- M5 • • Increment the counter C.
- M6 • • Store the name of map m in set s as N c .
- M7 • • From Formula 2 and the stored data, calculate the position (x c , y c ) and store it in the RAM 34.
- M8 • • From the stored data, convert the style of the map position to (X c , Y c ) and store it in the RAM 34.
- M10 • Next m
- M12 Activate the text display 24 to inform the user of the name of the series of maps or atlas.
- M13 For each map I from 1 to C:-
- FIG. 5 An example of the display which might be produced is shown in Figure 5.
- the top part of the text display 24 shows the name of the atlas. This is followed by the names of those maps (page numbers) which show that position and, for each page number, the grid block which contains that position.
- the example display assumes that the data which is read from the atlas contains the data for the large scale set of maps, then for the medium scale set of maps, and then for the small scale set of maps.
- the graphical display 26 shows the relative position within the grid block of the first map which is listed, i.e. within Block G 2 on Page 173.
- Figure 6 shows a second embodiment of the invention.
- a digitising tablet 40 has ledges 42, 44 along its bottom and left edges against which the bottom and left edges of a map or atlas 46 can be registered.
- a cursor 48 is movable over the atlas and inco ⁇ orates many or all of the features of the apparatus 10 of Figure 5.
- the cursor 48 and digitising tablet 40 co-operate in a known way so that the MPU 28 can determine the position of a reference point 50 of the cursor 48 with respect to the co- ordinate system of the digitising tablet 40, as denoted by dashed lines 51 in the drawing.
- the data which is associated with the atlas also includes, for each map, information relating the co-ordinate system of that map with the co-ordinate system of the digitising tablet 40 when the atlas is registered with the ledges 42, 44 and the atlas is open at the map in question.
- the data may also include the co-ordinates (u L , v B ) and (u R , v ⁇ ), as shown in Figure 6, of those two comers in ter s of the digitising tablet's co-ordinate system.
- the particular point may be the current position, or it may be a target position which has been entered and stored in the RAM 34 by placing the cursor over that position on the map and pressing a push-button 54. Also, the MPU 28 can calculate the distance between the current position and the stored position, and the bearing of one with respect to the other, and display this information on the display 24.
- the apparatus may be simplified so that it deals with only one map, or only one page of an atlas, at a time, the data for that map or page being read from, for example, a bar code or magnetic stripe printed on the map or page.
- the data associated with the map(s) is machine-readable.
- the data may be provided as user-readable encoded text, and the apparatus may have a key pad or the like to enable a user to enter the encoded text, the text then being decoded by the MPU 28.
- the apparatus may be arranged to display the details (including the position in the grid block on the graphical display 26) of only a selected one of the maps or pages, but with an indication that others are available. A push button may then be provided so that the user can cycle through the available details. Also, in the case where the map positions relate to different sets of the maps, and the selected map ceases to cover the current position, the MPU 28 may be programmed initially to select for display another map from the same series.
- the graphical display 26 shows only the current relative position in the grid block.
- it may be arranged also to show previous positions so that a trail is built up as the user moves their position, with the current position displayed differently to the previous positions, for example blinking.
- a push button may be provided whose operation causes the previous positions to be cleared if the display becomes too cluttered.
- the graphical display may be modified so that it is transparent and can be registered with the appropriate grid block of the map so as to show the current position in that grid block.
- the data which is associated with the map would include data from which the actual size of the grid blocks on the paper of the map can be determined.
- the graphical display may be omitted.
- the apparatus may be modified so as to display the current position also in terms of latitude and longitude.
- the data which is associated with each map may be encrypted, and the MPU 28 may be programmed to perform a suitable decryption algorithm so as to hinder the use of unauthorised data.
- the MPU 28 tests each of the maps in a predetermined order to determine which of the maps covers the current position. Once a map has been found which covers the current position, if that map then ceases to cover it, the current position should then be covered by a map covering an adjacent part of the earth's surface.
- the data provided for each map may also include information on the maps covering adjacent areas, and the MPU 28 may be programmed to use that information in order to increase the speed with which the next map may be found.
- the MPU 28 may be programmed to be able to perform different transformation functions, for example for flat-earth, Mercator and transverse Mercator, and the data associated with each map or series of maps or atlas may include parameters defining the transformation function to be used for that map, or that series of maps or atlas, or for particular sets of maps in the series or atlas.
- the data may include the transformation function(s) itself, which is then loaded into the apparatus when the data is read.
- the apparatus need not include a GPS receiver, but instead may have an input to receive an output from a separate GPS receiver. Also, the apparatus may be built in to some other apparatus having other functions. Furthermore, the display may be separately housed, for example on the dashboard of a vehicle, whilst other parts of the apparatus are mounted elsewhere.
- the invention may be put into effect by providing an accessory for a standard palm-top computer, such as a Psion Organiser.
- the accessory may comprise a GPS receiver connected to an interface card which may be inserted into one of the card slots of the palm-top computer. Accordingly, the computer, interface card and GPS receiver can perform the functions described above, with the display of the palm-top computer being used to provide both the text display 24 and the graphical display 26 described above.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US09/077,118 US6304819B1 (en) | 1995-11-21 | 1996-11-19 | Locating positions on maps |
EP96938397A EP0866948A1 (en) | 1995-11-21 | 1996-11-19 | Locating positions on maps |
AU75841/96A AU7584196A (en) | 1995-11-21 | 1996-11-19 | Locating positions on maps |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9523822A GB2307553B (en) | 1995-11-21 | 1995-11-21 | Locating positions on maps |
GB9523822.6 | 1995-11-21 |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/077,118 A-371-Of-International US6304819B1 (en) | 1995-11-21 | 1996-11-19 | Locating positions on maps |
US09/900,574 Division US6498984B2 (en) | 1995-11-21 | 2001-07-06 | Locating positions on maps |
Publications (1)
Publication Number | Publication Date |
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WO1997019322A1 true WO1997019322A1 (en) | 1997-05-29 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/GB1996/002849 WO1997019322A1 (en) | 1995-11-21 | 1996-11-19 | Locating positions on maps |
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Country | Link |
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US (2) | US6304819B1 (en) |
EP (1) | EP0866948A1 (en) |
AU (1) | AU7584196A (en) |
GB (2) | GB2307553B (en) |
WO (1) | WO1997019322A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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WO1999056082A1 (en) * | 1998-04-23 | 1999-11-04 | Yeoman Marine Limited | Referencing maps with respect to digitising apparatuses |
Families Citing this family (58)
Publication number | Priority date | Publication date | Assignee | Title |
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GB2307553A (en) | 1997-05-28 |
EP0866948A1 (en) | 1998-09-30 |
GB2307553B (en) | 2000-07-05 |
US20020002439A1 (en) | 2002-01-03 |
GB9523822D0 (en) | 1996-01-24 |
GB2345542B (en) | 2000-08-23 |
US6304819B1 (en) | 2001-10-16 |
GB0011699D0 (en) | 2000-07-05 |
AU7584196A (en) | 1997-06-11 |
GB2345542A (en) | 2000-07-12 |
US6498984B2 (en) | 2002-12-24 |
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