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Figure 4-10.-Underwater log system.

switch and is operated by the throttleman. The shaft

rpm is used to determine approximate ship’s speed.

OUTPUT SIGNALS

The underwater log system (fig. 4-10) provides

60-Hz synchro signals scaled at 40 and 100

knots/revolution and 400-Hz signals scaled at 10, 40,

and 100 knots/revolution. A resettable distance counter

is provided on the front of the indicator-transmitter.

Distance output is a 60-Hz synchro signal scaled at 360

revolutions per nautical mile.

SUMMARY

In this chapter, we introduced some of the most

common gyrocompass systems—Mk 19, Mk 23, Mk 27,

and AN/WSN-2. Additionally, we talked about the

AN/WSN-5 inertial navigation system, electro-

magnetic underwater log system, and the data they

Supply.

If a failure were to occur in one of these systems and

introduce error to your equipment, you are now better

able to isolate the faulty equipment and restore the

overall system operability.

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