Rainbow Electronics GE863-GPS low power - Manual (Page 98)

GE863-GPS Software User Guide
1vv0300724 Rev. 3 - 05/07/07
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5.2.2 GPS SERIAL PORT B (NMEA)
This port is carrying out the GPS navigation data in NMEA 0183 format.
The default configuration is 4800 bps, 8, n, 1
It is available on the following pins:
PIN # NAME DESCRIPTION TYPE
68 TX_GPS GPS TX Data (N MEA) CMOS 2.8 V
73 RX_GPS GPS RX Data (NMEA) CMOS 2.8 V
5.3 WGS 84
GPS receivers perform initial position and velocity calculations using an earth-centered earth-fixed
(ECEF) coordinate system. Results may be converted to an earth model (geoid) defined by the
selected datum. For GE863-GPS the default datum is WGS 84 (World Geodetic System 1984) which
provides a worldwide common grid system that may be translated into local coordinate systems or
map datums. (Local map datums are a best fit to the local shape of the earth and not valid worldwide).