TM 55-1930-209-14&P-17
g.
Setting the SHALLOW ALARM circuit.
NOTE
Circuit sounds an audible alarm if boat is navigated into area
where water depth is SHALLOWER than alarm setting. It can also
be used as navigational tool to give notice when a bottom contour
line on a marine chart has been reached.
(1) Set the SHALLOW ALARM toggle switch to ON (up) position. (The Deep Alarm toggle switch must be off.
(2)Set the ALARM SET/DEPTH toggle switch to the ALARM SET (up) position.
(3) Adjust the SHALLOW ALARM knob slowly until LCD displays 06.0 feet (depth of the outboard drive plus a
safety factor when workboat is loaded). SHALLOW ALARM may be set to alert operator of any desired depth
within SHALLOW ALARM depth range (Shallow Range: 1.9 ft to 99.9 ft).
CAUTION
When using the SHALLOW ALARM system, remember that
depthfinder transducer is mounted on workboat stern. Although
the transducer sends and receives signals in a cone-shaped
pattern from the stern to and from sea bottom, the SHALLOW
ALARM system is not foolproof at predicting water depth in
front of the workboat, especially when the workboat is operated
at higher rates of speed.
(4) Set the ALARM/SET toggle switch to DEPTH (down) position to resume reading water depth on the
LCD. The SWALLOW ALARM is now set and activated.
h.
Setting the DEEP ALARM circuit:
(1)
Set SHALLOW ALARM toggle switch to OFF position.
(2)
Set the DEEP ALARM toggle switch to ON (up) position.
(3)
Set the ALARM SET/DEPTH toggle switch to the ON (up) position.
(4)
Adjust the DEEP ALARM knob slowly to the desired alarm depth (Deep Range: 4 ft 500 ft).
(5)
Set the ALARM/SET toggle switch to DEPTH (down) position to resume reading water depth on the LCD.
The DEEP ALARM is now set and activated.
i.
The SHALLOW and DEEP alarms must be set separately but both may be operated simultaneously.
With both the SHALLOW ALARM and DEEP ALARM toggle switches turned ON, the depthfinder is able to alert the
operator when maximum and minimum depth settings have been exceeded. Refer to Appendix B for detailed
instructions for using, operating, and troubleshooting the Aqua Probe Model 550 depthfinder.
j.
Preventive maintenance instructions for the depthfinder are contained in Chapter 2, TM 55-1930-209-14&P-19.
NOTE
For additional information on depthfinder operations, read pages 9
thru 14 of the Aqua Probe Owner's Handbook in Appendix B.
2-13.3 Workboat operations
a.
Castoff from barge, ensuring that mooring lines are secured and not creating a safety hazard on deck or in the
water.
b.
At idle speed, maneuver away from barge.
2-19
