NAVSTAR GPS system, or simply GPS, is a satellite - based navigation system. The GPS system is based on 24 satellites circulating at 20,180 km above the Earth surface. For data transmission 1575,42 MHz frequency is used. There are two types of GPS signals: "C/A" code used by US Navy and open "P" code for commercial applications. The accuracy of P-code positioning is about 100 m. In order to increase the accuracy, a special differential GPS (or DGPS) system may be used. In addition to GPS - satellite data, DGPS uses information from surface-based GPS - stations (if available). Usage of differential GPS systems allows 5-10 m accuracy of positioning.
dKart Navigator family of marine navigation electronic chart systems supports wide range of external navigation devices: GPS and DGPS, GLONASS, ARPA, AIS transponder, autopilot, echosounder, etc.
GPS / GLONASS is used as a primary source of positioning information. The communication is based on NMEA-0183 protocol.
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dKart Explorer - basic electronic chart system - also uses GPS - receiver as a primary source of positioning information. The communication is based on NMEA-0183 protocol.
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Keywords: GPS, GPS software, GPS receiver, GPS system, GPS navigation, chart plotter, chartplotter, kartplotter, system, software, navigation, program.