Map reading system for indicating a user's position on a published map with a global position system receiver and a database
US5596500A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1994 |
| Grant date | Jan 21, 1997 |
| Priority date | — |
| Expiry date | Dec 23, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/13
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A combination of a GPS receiver for determining a user's position in terms of latitude and longitude, a database that indexes approximately 53,000 USGS 7.5 minute series topographical quadrangle maps by the latitude and longitude of at least one point on each map, and an interpreter and display that communicates the particular USGS map that represents the user's position together with the ruler dimensions left/right/up/down from a reference point on that map which pinpoints the user's position on the map. The database is stored in the permanent memory of the GPS receiver and the interpreter and display are controller by a microcomputer included in the GPS receiver. The reference points include sixteen intersections on the map of 2.5 minute intervals of latitude and longitude contained in each 7.5 minute series quadrangle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.