Manual

June 2004 Isis® Sonar User's Manual, Volume 2 74
Units (m, ft, ms)
Determines whether contact quantitative data are listed
in meters, feet, or milliseconds. The default is meters.
Next Line Is
These choices aid you in mensurating areas in a
contact.
• Width: Press
[Alt]-[F1] to identify the next
line you draw as a contact’s width.
• Length: Press
[Alt]-[F2] to identify the next
line you draw as a contact’s length.
• Shadow: Press
[Alt]-[F3] to identify the next
line you draw as a contact’s shadow.
Refer to ‘Contact Logging’ for a full description of
contact mensuration.
Set Constants…
Target uses several constants stored in the imagery
data file to calculate the position and dimensions of a
contact. These constants include the towfish speed, the
towfish heading and heading bias, and the horizontal
beam width of the sonar. In addition, if the towfish’s
position is not stored but the ship’s position is stored,
Target uses a stored towfish layback to calculate the
towfish’es and contact’s position.
Use the
Set Constants command to override or modify
the values of these constants coming from the imagery
data file.
Values entered in the
Speed, Horizontal Beam Width
and
Fish Layback boxes will be used by Target in
position and size calculations instead of the values
stored in the imagery data file. Any value entered in the
Local Variation box will be used as the towfish’es
heading bias and added to the stored heading of the
towfish.
Set Camera
Parameters…
Allows you to set parameters, including their Fore/Aft,
Left/Right, Up/Down offsets, their fields of views, and
their altitudes, for up to five cameras to be used with
Target.
Appendix E: Using the Target Utility