AP-2, Calculation with DS-60

APPENDIX

2. Calculation with DS-60

To measure the distance run between points A and B by DS-60, do the following:

1.Reset the distance run figure of DS-60 to zero by selecting Reset on the Trip DIST menu at the moment the ship passes point A.

2.Run the ship from A to B at full speed, timing with a stopwatch.

3.Read the distance run (nm) and time taken to run (second) exactly at the moment the shipshape point B.

4.Run the ship from B to A at full speed rehearing to step 1 through 3.

Where,

n1 (nm) = distance run from A to B measured by DS-60 n2 (nm) = distance run from B or A measured by DS-60

Therefore, the average run from A to B measured by DS-60

Therefore, the average ship speeds of run 1 and run 2 are calculated as follows.

Slog1 (kn) = n1/t1 X 3600

Slog2 (kn) = n2/t1 X3600

The average ship speed of round trip is Slog (kn) = (Slog1 + Slog2)/2 ...(6)

3.Speedily error From (5) and (6),

Error = (Sw - Slog)/Slog X 100 (%)... (7)

This error can be corrected at SPEED OFFSET on the system menu as follows:

1.Press the [MENU/ESC] key.

2.Select SYSTEM MENU and press the [ENT] key.

3.Select SPEED OFFSET and press the [ENT] key.

4.Enter the value of error.

Repeat the above procedure several times to satisfy the speed accuracy specification.