30-B
97MU001-F
ANTHEA OPERATION AND INSTALLATION MANUAL
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The real speed will be:
1,1 x 3600
364
= 10,9 knots
The average real speed will be:
10,1 + 10,9
2
= 10,5 knots
Suppose that during the first run over the base distance, the stop watch was started when
the distance counter was at:
24.1 miles
, and that it was stopped when the distance counter
was at:
25.4 miles
, the stop watch will have run 400 seconds.
The distance read from the distance counter will be: 25.4 - 24.1 = 1.3 mile.
Calculating the indicated speed gives:
1,3 x 3600
400
= 11,7 knots
During the second run the stop watch was started when the distance counter was at
26.0
mile
and stopped when the distance counter was at
27.2 miles
, the stop will have run 372
seconds.
The distance read from the distance counter is: 27.2 - 26 = 1.2 miles.
The speed calculated is:
1,2 x 3600
372
= 11,6 knots
The average value of the speeds indicated is :
11,7 + 11,6
2
= 11,65 knots
Error correction:
First evaluate the error in percentage.
In the above example, the error:
100 x (11,65 - 10,5)
11,65
= + 10 %
The correction to be made is therefore: - 10 %.
