4. ADJUSTMENT
4-17
4.6
Sea Trial Check
4.6.1
Ship’s speed test
Do the milepost test where ground tracking measurement can be done.
1. Reset the distance run at the moment the milepost test is initiated.
2. Read the distance run at the moment the milepost test is initiated.
3. Calculate true ship’s speed (1) from the data of the milepost test and ship’s speed of the
CI-68 from that of the distance run (2).
4. If the error between (1) and (2) is more than ± (1%+0.1 kn), correct it referring to the GT
SPD CALIB on page 4-5. Calibrating is not necessary when the error is within ± (1%+0.1
kn).
5. Repeat the milepost test several times. Record the data in Table 1.
6. Record the ship’s speed every 10 seconds in table 2.
7. Calculate the average ship’s speed from the data in the Table 2 to compute accuracy.
4.6.2
Current data check
Use the ground tracking mode to record the current (tide) data.
1. Run your boat following the square course shown below. Each side of the square is
about 1 mile in length.
Ship’s route:
Advance straight 1 mile approx.
Milepost test-1
2. Record the ship’s speed and tide data every 30 seconds in table 3.
Summary of Contents for CI-88
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