Where ‘hrtau’ is the new time constant that falls within the range of 0.0 to
3600.0 seconds.
Depending on the expected dynamics of the vessel, you may wish to adjust
this parameter. For instance, if the vessel is very large and is not able to turn
quickly, increasing this time is reasonable. The resulting heading would have
reduced ‘noise’, resulting in consistent values with time. However, artificially
increasing this value such that it does not agree with a more dynamic vessel
could create a lag in the rate of heading change measurement with higher
rates of turn. A convenient formula for determining what the level of
smoothing follows. If you are unsure on how to set this value, it’s best to be
conservative and leave it at the default setting.
hrtau (in seconds) = 10 / maximum rate of the rate of turn (in °/s
2
)
You may query the Vector for the current heading rate time constant by
issuing the same command without an argument.
$JATT,HRTAU<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 2.0 seconds.
8.12 $JATT,COGTAU
The course over ground (COG) time constant allows you to adjust the level
of responsiveness of the COG measurement provided in the $GPVTG
message. The default value of this constant is 0.0 seconds of smoothing.
Increasing the time constant will increase the level of COG smoothing.
The following command is used to adjust the COG time constant.
$JATT,COGTAU,cogtau<CR><LF>
Where ‘cogtau’ is the new time constant that falls within the range of 0.0 to
3600.0 seconds.
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