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-9.6-
RMA - Recommended minimum specific LORAN-C data
Position, course and speed data provided by a LORAN-C receiver. Time differences A and B are those used
in computing latitude/longitude. Checksum is mandatory in this sentence. This sentence is transmitted at
intervals not exceeding 2 s and is always accompanied by RMB when a destination waypoint is active. RMA
and RMB are the recommended minimum data to be provided by a LORAN-C receiver. All data fields must
be provided, null fields used only when data is temporarily unavailable.
Checksum, mandatory for RMA
Magnetic variation (000.0 - 179.9°), degrees E/W *2
Bearing, degrees *2
Speed over ground, knots 2*
Time difference B, 2*
(00000.0 - 99999.9 µs)
Time difference A, *2
(00000.0 - 99999.9 µs)
$--RMA, A, 1111.11, a, yyyyy.yy, a, x.x, x.x, x.x, x.x, x.x, a,a*hh<CR><LF>
Mode indicator (See note on page 9.3.) *1
Longitude, degrees, E/W
Latitude, degrees, N/S
Status (A = data valid, V = blink, cycle or SNR warning)
*1: Edition 2 only, *2: Not used
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.
Checksum, mandatory for RMB
Arrival status: A = arrival circle entered or perpendicular passed *2
Destination closing velocity, knots *2
Bearing to destination, degrees true
Range to destination, nautical miles
Waypoint longitude, E/W
$--RMB, A, x.x, a, c--c, c--c, 1111.11, a, yyyyy.yy, a, x.x, x.x, x.x, A,a*hh<CR><LF>
Mode indicator (See note on page
9.3.) *1
Waypoint latitude, N/S
Destination waypoint ID
Origin waypoint ID*2
Direction to steer, (L = Port R = Starboard) *2
Cross track error , nautical miles *2
Status (A = data valid V = navigation receiver warning)
*1: Eidition 2 only, *2: Not used