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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 - 179.90), degrees E/W
Course over ground, degrees true
Speed over ground, knots
*Time difference B,
(00000.0 - 99999.9 micro sec.)
*Time difference A,
(00000.0 - 99999.9 micro sec.)
$--RMA, A, llll.ll, a, yyyyy.yy, a, x.x, x.x, x.x, x.x, x.x, a*hh<CR><LF>
Longitude, degrees, E/W
Latitude, degrees, N/S
Status (A = data valid, V = blink, cycle or SNR warning)
*: Not used
RMC - Recommended specific GPS/TRANSIT data
Time, date, position, course and speed data provided by a GPS or TRANSIT navigation receiver.
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. RMC and RMB are
the recommended minimum data to be provided by a GPS or TRANSIT receiver. All data fields
must be provided, null fields used only when data is temporarily unavailable.
Checksum, mandatory for RMC
Magnetic variation (000.0 - 180.0
o
), degrees E/W
*Date: dd/mm/yy
Course over ground, degrees
$--RMC, hhmmss.ss, A, llll.ll, a, yyyyy.yy, a, x.x, x.x, xxxxxx, x.x, a*hh<CR><LF>
Speed over ground, knots
Longitude, E/W
Latitude, N/S
Receive status (V = navigation receiver warning)
*UTC of position fix
*: Not used
5.2 SENTENCE DESCRIPTION
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