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Learn the Sea
Secondary port correction
learnthesea.com
Apply the almanac differences to a standard port to get HW/LW time and height at the secondary port, interpolating for the day’s actual times and heights.
Secondary port
Standard port
Date
Time differences
| Standard port time | Difference | Secondary port time | |
|---|---|---|---|
Height differences
| Standard port height | Difference | Secondary port height | |
|---|---|---|---|