4.8.1 AIDING VIA GPS AND SPEED LOG
During vessel turns with small vessels a centrifugal force is generated from the turn. This force has a
negative effect on the accuracy of the angular and heave calculations. By input the vessel velocity to
the motion sensor, the centrifugal force can be estimated in the calculations in the motion sensor
and the centrifugal effect can be heavily reduced, improving the accuracy of the readings.
The SMC Motion Sensor accepts velocity input from a GPS or a speed log.
The accepted input strings for the velocity input are
$xxRMC
$xxRMA
$xxVTG
$xxVBV
$xxVHW
To confirm that the motion sensor is receiving data from the velocity device, select Verify Velocity
Input in the serial input tab. The motion sensor replies with information about the time since the last
reading and the velocity received. If N/A is displayed when clicking the button, the velocity input is
not working.