User Guide
3.
If necessary, adjust the frequency to better view the signal. If the lines in the display seem to
blur together, switch to a lower frequency range.If the lines run off the right edge of the display,
increase the frequency range.To adjust the frequency range:
Seawolf:
• Click
FREQUENCY SCALE
in the button matrix.A panel with frequency options appears.
• Click the desired scale.
• Click
BACK
.
688(I):
• Under Frequency Scale click the number of the desired frequency scale.The dial turns to the
selected number.
Akula:
• Under Freq. Scale click the number of the desired frequency scale.The dial turns to the selected
number.
4.
Set the Turns Per Knot (TPK) for the known target.
The TPK for all ships in the game can be
found in the U.S. Naval Institute reference file for the platform.To set Turns Per Knot and
determine contact’s speed:
Seawolf:
• Place the waterfall cursor over the line farthest left.
• Click
TURNS PER KNOT
in the button matrix.
• In the panel that appears, click either
INCREASE T.P.K.
or
DECREASE T.P.K.
as necessary to set the
desired TPK value.The selected value is seen in the Data Display in the Turns Per Knot field.The
speed for the designated TPK is displayed in the Speed field in the Data Display.
688(I):
• Place the waterfall cursor over the line farthest left. Click the blue Turns Per Knot switch
repeatedly to set the desired value for the known contact.The speed for the designated TPK
displays in the Speed field.
Akula:
• Place the waterfall cursor over the line farthest left.
• Click the
+
or
-
buttons in the Turns Per Knot panel to set the desired value for the known
contact.The speed of the target appears in the Speed field below the buttons.
When you have determined the speed of the contact, enter that speed in the TMA display for the
selected contact.
Using DEMON to determine a class type
By determining the number of blades on a contact’s propeller, listening to the sounds it emits and
observing the contact’s behavior you can make an educated guess as to the contact’s type.
1.
Select a sonar array as described above.
2.
Select a sonar contact by clicking on a tracker button as described above.Vertical lines appear
in the waterfall.The first line on the left indicates the shaft rotation speed.The other lines
indicate individual blades on the propeller.
3.
If necessary, adjust the frequency scale until the lines display clearly and individually on the
waterfall.
Use the following criteria to classify the selected contact:
Merchant Vessels/Tankers:
Typically three or four blades; noisy; often maintains predictable course.
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