Operation Manual

7.2. Activating log

When connected via NMEA 0183 interface to an external

GPS, it is possible with the FMD55 to receive, store and print

out the NMEA data record "GPS transit specific $ GPRMC",

which is practically a complete record of the route.

The formula for this data record must read as follows:

$GPRMC,111111,A,2222.222,N,33333.333,W,44.555.,

666666,77.,E*CS

All variants of this $GPRMC data record with the different

periods and commas will be recognised and processed.

Other data records other than RMC type will not be

recognised!!

The RMC data record has been defined however as the

standard data record for GPS equipment, so that all well

known models can be easily connected.

The contents of the data record are:

111111 -time in hhmmss

A -identity if data valid (A) or invalid (V)

2222.222 -latitude in degrees, minutes, 1/1000mins

N -direction - (N) north, (S) south

33333.333 -longitude in degrees, minutes, 1/1000mns

W -direction - (W) west, (E) east

44.44 -speed over ground (SOG in Kns)

555 -heading over ground (degrees)

666666 -date as DDMMYY

77 -deviation value

E* -check value

This data record will be memorised and stored by the FMD55.

The storage can hold 50 data records. When the storage is

full, the data will be automatically printed out.