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How to Determine the Height of Tide, Continued
OPNAV 3530/40 (4-73)
HT OF TIDE
Now that we have the subordinate station data, we can complete the
remainder of the problem; finding the height of the tide at the desired time
of 0700.
Duration
Rise
Fall
Time Fm
Near
16.
Tide
Range of Tide
Ht of Near Tide
Step
15.
17.
18.
Action
To compute this duration, find the
two subordinate stations’ times that
bracket your desired time. In this
case they are 0622 and 1331.
Calculate the total time difference
between the two (1331 - 0622 = 7
hours 09 minutes). We can tell by
observation that between 0622 and
133 1 the tide is rising. Enter this
data on the worksheet.
Next, determine the time nearest
high/low for which the desired tide
height is required. In this case the
desired time of 1100 is nearest to
high tide at 133 1. Now find the time
difference between the two
(1331 - 1100 = 2 h 31m). Enter this
data on the worksheet.
Now calculate the range of tide.
Simply find the difference between
the height of high and low tide from
the same two subordinate station
times bracketed for duration above
(3.9 - 1.0 = 2.9). Enter this data or
the worksheet.
Enter the height of the nearest tide
this case from the high tide at 1331.
Completed Strip
Form
7h 09m rising
2h 31m
2.9
3.9 ft
7-10
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