KVH Industries TracVision G4 - Manual (Page 78)

Entering Gyro Offset Values
The sensor module housing must be mounted as close to level in
pitch and roll as possible, with its long axis parallel to the vessel’s
centerline. Sometimes allowances must be made for the particular
installation where pitch, roll, and azimuth references cannot be
met. The offset values adjust for this. The allowable offset values
for pitch and roll are ±45
º ; the offset for azimuth can be up to
±180 º . Once entered, offset values will not need to be changed
unless the sensor module is relocated.
Using the ADCU Interface
54-0147 75
Proceed to
"Choosing the
Default Display"
Set Gyro offsets?
Yes Next Return
Set offset Pitch?
Yes Next Cancel
Set Pitch: +XX.X°
- Enter +
Set offset Roll?
Yes Next cancel
Set Roll: +XX.X°
- Enter +
Set Yaw: +XXX.X°
- Enter +
Set offset Yaw?
Yes Next Cancel
Figure 3-18
Entering Gyro Offset Values
Pitch, roll, and yaw settings are
determined by the sensor module’s
internal inclinometer, not external
measurements.
To set pitch, roll, and yaw properly,
initially enter zeros for all
measurements. Choose the Pitch,
Roll, and Yaw display from the Main
Menu and record those numbers.
Reverse the value of the Pitch and
Roll (positive becomes negative,
negative becomes positive).
Return to the Gyro Offset menu
and enter the recorded numbers.
This process should be carried out
in still water or at the dock.
As noted in Section 2.3, “Mounting
the GyroTrac Sensor” on page 19,
the sensor must be aligned to
within ±5
º of the vessel’s fore-and-
aft centerline. Deviation beyond ±5 º
will degrade pitch, roll, and yaw
accuracy.