User Guide

Section 11: Akula Stations
11-18
3. In ARRAY SELECT click the desired sensor button in the submarine
outline. The button on the bow of the outline selects the Cylindrical
Array. The aft button selects the Towed Array. A raised ridge rims the
selected button.
4. Under DEMON DISPLAY click the round silver button associated with
the desired contact ID. A red ring around the button indicates that
button is selected.
 Note: If the game is paused, no lines appear in the waterfall display.
5. 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, click the desired number on the
FREQ. SCALE Dial.
6. Determine the Turns Per Knot (TPK) for the known target. The TPK
information for all ships in the game can be found in the U.S. Naval
Institute Reference entry for the platform class.
7. Place the waterfall cursor over the line farthest left.
8. 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.
9. When you have determined the speed of the contact, enter that speed
in the TMA field for the selected contact.
Using DEMON to Determine Category
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 category of the contact.
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 help categorize the selected contact:
Merchant Vessels/Tankers: Typically three or four blades; noisy;
often maintains predictable course.
Warships: Typically four or five-bladed propellers; quieter, smoother
sound than merchant ships; possibly unpredictable course changes.
Submarines: Five, six or seven-bladed propellers; very quiet when
submerged and at low speed; unpredictable course changes.