Manual

June 2004 Isis® Sonar User's Manual, Volume 2 153
Z-axis
The
Z offset accounts for the difference between the reference point
and the instrument (SeaBat or other multibeam head, Nav, MRU). If
the multibeam instrument is mounted below the reference point (for
example, deeper in the water), the Z offset value should be positive.
Yaw, Pitch, and Roll
You can have Isis compensate for a SeaBat’s motion in these three
dimensions by typing numerical values representing the number of
degrees by which the SeaBat’s attitude varies from the ship’s stated
course. Again, right-hand coordinate system reckoning applies.
• For
Yaw: Type negative degrees if the SeaBat is set to
yaw right; enter positive degrees if the SeaBat is set to
yaw left.
• For
Pitch: Type negative degrees if the SeaBat is set to
pitch down; enter positive degrees if the SeaBat is set
to pitch up.
• For
Roll: Type negative degrees if the SeaBat is set to
roll left; enter positive degrees if the SeaBat is set to
roll right.
• For
Nav: port = negative, starboard = positive;
north = positive; Z = positive if reference point is below
or negative if reference point is above.
Height of
Reference Point
above Water Line
Unless you have chosen your reference point to be at the water line,
you will need to enter the appropriate offset, in meters, here.
Appendix I: Working with Specific Sonars