User Guide

When a good match between the tick marks, the bearing lines and the dot stack has been
achieved, enter the trial solution to send this information to the Fire Control system.The system
tracks the estimated position of the contact based on this system solution and uses that estimated
location when targeting the contact.
Seawolf:
• Click ENTER SOLN beneath the TMA Board.
688(I):
• Click ENTER SOLUTION in the TMA Solution Input panel below the TMA board.
Akula:
• Click ENTER SOLUTION below the TMA board.
The system solution displays on the TMA screen in a separate location from the trail solution input
area as described below.
■ Seawolf: The system solution displays in the Firing Solution area of the TMA Data Display on the
right-hand side of the station.
■ 688(I) and Akula: The system solution displays in the TMA Solution panel at the lower right of
the TMA station.
NOTE: The system solution for a contact can be viewed in these locations but they can not be
adjusted there.To update the system solution, adjust the ruler or directly input information in
the trial solution fields and enter the solution again.
7. Change course and/or speed.
Changing your course and/or speed can refine the TMA solution.This changes the relative motion
between your submarine and the contact.After steadying on the new course and/or speed, adjust
the ruler to achieve the best fit.This second "leg" should help to eliminate solutions that are
unreasonable.A third "leg" or more will refine the solution further.
■ With experience, you’ll learn when the solution is good enough to support a weapon launch.
NOTE: Depending on the tactical situation, continued TMA may not be practical.
■ If one TMA solution does not fit the entire observed sensor bearing data, consider the fact that
the contact itself may have changed course and/or speed.Attempt to achieve a better fit of the
ruler by disregarding some of the earlier bearing lines and looking only at recent bearings.
8. Merge contacts when necessary.
If the same contact is tracked by more than one sensor (e.g., a contact tracked by passive sonar
and radar), the data can be merged into a "master" contact. (Master contacts have alphanumeric
designations that begin with the letter M.) This can be very useful if you have a good range from
one sensor (radar or active sonar) and a good bearing history from another (passive sonar).
Seawolf:
• Click SELECT TRACKS .The second level button matrix appears.
• Select a contact from the
Select drop-down list.
• From the
Merge drop-down list select the contact you want to merge with the contact in the
Select drop-down list.
• Click
MERGE .
688(I) and Akula:
• Click the Selected Track drop-down and select the one of the contacts to be merged.
• From the
Merge Track drop-down select the track to be merged with the contact selected in the
Selected Track drop-down list.
• Click
MERGE .
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