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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

datums. (Local map datums 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 Unit Description

Message ID $PSRF106 PSRF106 protocol

header

Datum 178 21=WGS84

178=TOKYO_MEAN

179=TOKYO_JAPAN

180=TOKYO_KOREA

181=TOKYO_OKINAWA

Debug

Checksum *32

<CR><LF> End of message

termination