Specifications

-5.4-
RMC – Recommended Minimum Specific GPS Data
Checksum, mandatory for RMC
Magnetic variation (000.0 - 180.0°), degrees E/W
Date: dd/mm/yy
Course over ground, degrees True
$--RMC, hhmmss.ss, A, 1111.11, a, yyyyy.yy, a, x.x, x.x, xxxxxx, x.x, a,a*hh<CR><LF>
Speed over ground, knots
Longitude, E/W
Latitude, N/S
Receive status (V = navigation receiver warning)
UTC of position fix
RPM – Revolutions (PAS 102)
Shaft or engine revolution rate and propeller pitch.
$--RPM, a, x, x.x, x.x, A*hh<CR><LF>
Status: A = data valid
Propeller pitch, % of maximum, “-” = astern
Speed, revolutions/min, “-” = counter-clockwise
Engine of shaft number, numbered from center-line
Odd = starboard, even = port, 0 = single or no center-line
Source, shaft/engine S/E
RSA - Rudder sensor angle
$--RSA, x.x, A, x.x, A*hh<CR><LF>
Port rudder sensor (see note), Status: A = data valid
Starboard (or single) rudder sensor (see note), Status: A = data valid
NOTE - Relative measurement of rudder angle without units, “-” = turn to port. Sensor output is
proportional to rudder angle but not necessarily 1 : 1.