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Current Calculations, Continued
Flood Dir
OPNAV 3530/41 (4-73)
VEL OF CURRENT
Time Diff
Slack Water
Time Diff
Max Current
Vel Ratio
Max Flood
Vel Ratio
Max Ebb
Ebb Dir
Step
5.
6.
7.
8.
9.
10.
Action
Inspect reference station time data.
Determine whether the desired time
falls between flood or ebb times. In
our case the current is flooding. We
need to know this to determine which
slack water time difference to use.
Table 2 labels slack water as Min.
before Flood or Min. before Ebb.
Enter the time difference.
Enter the flood time difference.
Follow the data to the right and find
the values for velocity ratios and
directions from the SPEED RATIOS
and AVERAGE SPEED AND
DIRECTIONS columns.
Enter ratio.
Enter direction.
Enter direction.
Completed Strip
Form
- 0 41
- 0 47
1.1
1.0
195°
000°
7-20
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