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Operation | HS60 GPS Compass User Guide
nimble, increasing this value can create a lag in measurements. If
you are unsure on how to set this value, it is best to be conservative
and leave it at the default setting.
¼ Note: For heading and rate of turn there is no lag once the gyro is
calibrated and enabled.
Rate of Turn (ROT) time constant
The default value of this constant is 2.0 seconds of smoothing.
Increasing the time constant increases the level of ROT smoothing.
Course Over Ground (COG) time constant
The default value of this constant is 0.0 seconds of smoothing.
Increasing the time constant increases the level of COG smoothing.
COG is computed using only the primary GPS antenna and its ac-
curacy depends upon the speed of the vessel (noise is proportional
to 1/speed). This value is invalid when the vessel is stationary, as tiny
movements due to calculation inaccuracies are not representative
of a vessel’s movement.
Speed time constant
The default value of this constant is 0.0 seconds of smoothing.
Increasing the time constant increases the level of speed measure-
ment smoothing.
Watchdog
The watchdog is a timer that is controlled by the software that
monitors if the heading is lost. The watchdog software is compliant
with IEC 60945.
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