Programming Manual 76
As with the heading time constant, the setting of this value depends upon the
expected dynamics of the vessel. If a boat 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. If you are unsure what the best
value for this setting is, it’s best to be conservative and leave it at the default
setting.
cogtau (in seconds) = 10 / maximum rate of change of course (in °/s)
You may query the Vector for the current heading time constant by issuing
the same command without an argument.
$JATT,COGTAU<CR><LF>
Note - If you are unsure of the best value for this setting, it’s best
to be conservative and leave it at the default setting of 0.0 seconds.
8.13 $JATT,SPDTAU
The speed time constant allows you to adjust the level of responsiveness of
the speed measurement provided in the $GPVTG message. The default
value of this parameter is 0.0 seconds of smoothing. Increasing the time
constant will increase the level of speed measurement smoothing.
The following command is used to adjust the speed time constant.
$JATT,SPDTAU,spdtau<CR><LF>
Where ‘spdtau’ is the new time constant that falls within the range of 0.0 to
3600.0 seconds.
As with the heading time constant, the setting of this value depends upon the
expected dynamics of the vessel. If a boat is highly dynamic, this value should
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