Furuno FR-1500 - Manual (Page 108)

-8.8-
RMB - Recommended minimum navigation information
Navigation data from present position to a destination waypoint provided by a LORAN-C, TRANSIT,
OMEGA, GPS, DECCA, navigation computer or other integrated navigation system. Checksum is
mandatory in this sentence. This sentence always accompanies RMA or RMC sentences when a
destination is active when provided by a LORAN-C, TRANSIT or GPS receiver, other systems may
transmit $--RMB without $--RMA or $--RMC.
NOTE 1: If range to destination exceeds 999,9 nautical miles, display 999,9.
NOTE 2: Positioning system Mode indicator:
A= Autonomous mode
D= Differential mode
E= Estimated (dead reckoning) mode
M= Manual input mode
S= Simulator mode
N= Data not valid
NOTE 3: The positioning system Mode indicator field supplements the Status field (field No.1), which
shall be set to V = invalid for all values of Mode indicator except for A = Autonomous and D = Differential.
The positioning system Mode indicator and Status fields shall not be null field.
$--RMB, A, x.x, a, c--c, c--c, llll.ll, a yyyyy.yy, a,x.x, x.x, x.x,A,a*hh<CR><LF>
Checksum, mandatory for RMB
Mode indicator (see note 2 and note 3)
Destination closing velocity, knots*
Bearing to desination,degrees true
Destination waypoint latitude, N/S*
Range to destination, mautical miles (see note 1)
*: Not used
Destinaton waypoint longitude, E/W*
Distination waypoint ID*
Origin waypoint ID*
Status (see note 3): A= data valid, V= navigation receiver warning
Arrival status*
Direction to steer L/R*
Cross track error*