Saab R5 SUPREME AIS, Operation & Installation Manual

Page: 45 / 156

R5
SUPREME - Navigation System
CONFIGURATION
7000 118-301, A3 Page 45
The setting of this parameter depends upon the
expected dynamics of the vessel. If a ship is highly
dynamic, this value should be set to a lower value since
the filtering window needs be shorter in time, resulting
in a more responsive measurement. However, if a
vessel is very large and has much more resistance to
change in its motion, this value can be increased to
reduce measurement noise. The following formula
provides some guidance on how to set this value:
SOG smoothing = 10 / maximum acceleration (in m/s²).
If unsure on which value to set, it's best to be
conservative and leave this parameter at the default
setting of 0.00 seconds.
COG Smoothing The COG Smoothing parameter allows you to adjust
the level of responsiveness of the course over ground
(COG) measurement, as displayed by the R5
SUPREME CDU and provided in the $GPVTG and
$GPRMC sentences. The default value is zero, and
increasing the value will increase the level of COG
smoothing.
As with the SOG smoothing parameter, the setting of
this parameter depends upon the expected dynamics of
the vessel. If a ship is highly dynamic, this value should
be set to a lower value since the filtering window needs
be shorter in time, resulting in a more responsive
measurement. However, if a vessel is very large and
has much more resistance to change in its motion, this
value can be increased to reduce measurement noise.
The following formula provides some guidance on how
to set this value initially. It is however recommended
that you test how the revised value works in practice.
COG smoothing = 10 / maximum rate of change in
course (in °/s).
Note: The ship needs to be moving to calculate a valid
COG value. Do not use COG values output while the
ship is at rest as a basis for adjusting this parameter.
If unsure on which value to set, it's best to be
conservative and leave this parameter at the default
setting of 0.00 seconds.
4.2.3 SBAS
This view is accessed by pressing Main Menu

Maintenance

Configuration

GPS/DGPS

SBAS
Parameter Name Description