August 2020 – TD 316 OPERATING MANUAL – Motus Wave Sensor 5729
Page 53
3.10.5
External Compass Settings
Figure 3-29: External Compass Settings in User Maintenance
To use an external compass you need to select
Enable Ext Compass Input
but then to use this compass reading in
calculation you also need to select the
Enable Ext Compass Correction
otherwise it will only store and/or output the
reading as external compass
. Ext Compass Alignment Offset (Deg.M)
is the angle in Degrees Magnitude used to
compensate for a compass misalignment. The value is added to the parameter
External Heading
.
Two different alternatives are available in
Compass Type
as external compass
:
•
HSC100 NMEA
•
Generic NMEA
Compass Warm-up Time (s)
is the time in seconds needed from power is switched on to the external compass until it
is ready to output compass data. To save power the
Enable Compass Power Control
might be set. If disabled, the
compass is always on.
Compass Start Offset Time (s)
is the Offset time from the start of each recording interval until
the start of the external compass. Only used when
Enable Compass Power Control
is activated.
Compass Sampling
Interval (s)
is the interval between each new start of the external compass sampling. This interval has to be bigger than
N/fs where N is the
Compass Sample Average Number
and fs are the
Compass Sampling frequency (Hz)
. Only
used when
Enable Compass Power Control
is activated.
Compass Sample Average Number
is the number of
samples to be taken from the external compass and averaged before the power to the external compass is switched off
again. Selectable number of values is 4, 8, 16, 32, 64 and 128. Only used when
Enable Compass Power Control
is
activated.
Compass Sampling Frequency (Hz)
is the frequency which the sensor is sampling the compass, 1Hz is the
only alternative yet.
