Furuno RD-50 Operator's Manual page 80

APPENDIX 4 DIGITAL INTERFACE
MTW - Water temperature
$--MTW, x.x, C*hh<CR><LF>
Checksum
Temperature, degrees C
MWV - Wind speed and angle
$ MWV, x.x, a, x.x, a, A*hh<CR><LF>
--
Reference, R=relative, T=true
Wind angle, 0 to 359 (degrees)
RMB - Recommended minimum navigation information
$--RMB, A, x.x, a, c--c, c--c, llll.lll, a, yyyyy.yyy, a, x.x, x.x, x.x, A, a*hh<CR><LF>
Direction to steer L/R
Cross track error (see Note 2), nautical miles
Status (see Note 4), A=data valid, V=navigation receiver warning
Note 1: If range to destination exceeds 999.9 nautical miles, display 999.9.
Note 2: If cross track error exceeds 9.99 nautical miles, display 9.99.
Note 3: Positioning system mode indicator:
A=Autonomous, D=Differential, E=Estimated (dead reckoning),
M=Manual input, S=Simulator, N=Data not valid
Note 4: The positioning system mode indicator field supplements the status field (field No. 1),
which should be set to V=invalid for allvalues of Mode indicator except for A=Autonomous
and D=Differential. The positioning system mode indicator and status fields should not be
null fields.
AP-10
Checksum
Status, A=data valid, V=data invalid
Wind speed units,
K (km/h) / M (m/s) / N (knots)
Wind speed
Destination waypoint latitude, N/S
Destination waypoint ID
Origin waypoint ID
Checksum
Mode indicator (see Note 3 and 4)
Arrival status: A=arrival circle entered
or perpendicular passed, V=not
entered or passed
Destination closing velocity, knots
Bearing to destination, degrees true
Range to destination, nautical miles (see Note 1)
Destination waypoint longitude, E/W