User Guide

TMA ON RADAR, ACTIVE SONAR AND VISUAL
CONTACTS
Some sensors give you a range as well as a bearing, while others only give you a bearing. In
general, the more inputs you have from different sensor sources the better your solution will be.
But be aware that using Radar and Active Sonar give your enemy valuable information about your
presence and location.
Contacts marked with active sonar, radar and the Stadimeter appear as a bearing/range pair on the
TMA Board.What you see is a bearing line ending with a tiny triangle positioned at the range of the
contact. If the target’s bearing and range are known at two different times, as is the case with
active sonar and radar, the solution can be found by connecting dots and ‘drawing a line’ with the
ruler for course and speed.
A UUV in active mode provides returns from the location of the UUV in TMA and on the Nav and Fire
Control maps.
NOTE: Marking a contact with the periscope does not give you an automatic range. But using the
Stadimeter to manipulate a photo of the visual contact can provide you with a range that is
fairly accurate. See Ship Stations/Stadimeter Station on p. 141.When visual or periscope
contacts are referred to in this section, it is assumed that you have determined a range for
the contact and marked it in the Stadimeter Station.The Periscope and Stadimeter Stations
work hand in glove.
To determine a target solution from Active Sonar, the Periscope or the Radar:
1. Select a contact to analyze. Radar contacts have an R designation, visual contacts have a V
designation, active sonar contacts have an S designation the same as passive sonar contacts.A
bearing line appears on the TMA board.A tiny triangle at the end of the bearing line indicates the
target’s range at time the contact was marked.
Seawolf:
• Click SELECT TRACKS in the Button Matrix. (If no contacts have been designated, the second level
of matrix buttons is not revealed.)
• From the
Select drop-down list, select the desired Contact ID.
• Press
BACK to return to the Main Button Matrix.
688(I) and Akula:
• Click the Select Track drop-down list and select the desired contact. No contacts appear in the
drop-down lists if no contacts have been designated.
2. Mark the contact again.
• After a short interval, return to the active sonar or radar station (whichever you are using) and
mark the contact again.
• For visual contacts, take another photo of the contact from the periscope and manipulate it in
Stadimeter, then mark the contact again from the Stadimeter Station.
• Continue to mark the contact at different intervals to accumulate several bearing lines. Toggle
back and forth between the TMA and your chosen sensor.
3. Adjust the view to get a clear view of the ruler and the range triangle.
• Click the arrow buttons to pan the view.(The keyboard arrow keys can also be used.)
• Move the ruler to the location of the range triangle, click
CENTER ON RULER then click the zoom
buttons to better adjust your view. If you lose site of the ruler, zoom all the way out or reselect
CENTER ON RULER .
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