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K.2 Common Message Elements<br />

NMEA Output Messages K<br />

Each message consists of:<br />

A message ID consisting of $GP followed by the message type.<br />

For example, the message ID of the ALM message is $GPALM.<br />

A comma.<br />

A number of fields that depends on the message type, separated<br />

by commas.<br />

An asterisk.<br />

A checksum.<br />

Here is an example of a simple message with six fields plus the<br />

message ID and checksum:<br />

$GPZDA,004405.25,30,09,1994,00,00*6B<br />

K.2.1 Latitude and Longitude<br />

Latitude is represented as ddmm.mmmm and longitude is represented<br />

as dddmm.mmmm, where:<br />

K.2.2 Direction<br />

dd or ddd is degrees<br />

mm.mmmm is minutes and decimal fractions of minutes<br />

Direction; north, south, east, or west; is represented by a single<br />

character: N, S, E, orW.<br />

TSC1 Asset Surveyor Operation Manual 423

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