USGlobalsat EM-406a - Manual (Page 13)

EM-406a
Specifications are subject to be changed without notice.
Page 13 of 13
Version 1.4.1
G). Select Datum ID:106 Selection of datum to be used for coordinate transformations
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. 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 Datum.
(Local map Datum are a best fit to the local shape of the earth and not valid worldwide.)
Examples:
Datum select TOKYO_MEAN
$PSRF106,178*32
Name Example Units Description
Message ID $PSRF106 PSRF106 protocol header
Datum 178 21= WGS84
178= Tokyo_Mean
179= Tokyo_Japan
180= Tokyo_Korea
181= Tpkyo_Okinawa
Checksum *32
End of message termination
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