Instruction Manual

Page 5
Bias - apply a single bias to the computed CMG heading
Change Cutoff - cutoff value for CMG calculation (in degrees)
 Sensor - uses the heading found in the XTF sensor navigation
 Ship - uses the heading found in the XTF ship navigation
Speed
Filter Speed - the checkbox turns the option on
 Min - enter the minimum expected speed
 Max - enter the maximum expected speed
 Change Cutoff - cutoff value for speed filter (in knots)
Compute
 Never - use the speed from the XTF file
 Always - ignore existing speed and re-compute
 When Zero - only computes speed if the value in the file is zero
Mag Heading Deviation
 Only available for Sensor and Ship heading options
 On Check Box - turns the option on
 0, 90, 180, 270 - Enter the corrected heading for each of cardinal compass
points. The mosaic engine will generate a smoothed correction curve
interpolating between these values
Important Note: Navigation source is not always as obvious as it sounds.
Generally SHIP navigation is used for hull or pole mounted sonars and
SENSOR is used for towed sonars. However what is actually stored in these
two locations in the XTF file is determined by the surveyor during
acquisition setup and what software was used to acquire the data.