Question 1

A secondary port’s tide times are found by…

Accepted Answer

Applying published time and height differences to a standard port — The almanac lists differences (often different at springs and neaps — interpolate) against a named standard port. The planner’s secondary-port exercise drills exactly this.

Question 2

UK tide tables are printed in UT. In British Summer Time you must…

Accepted Answer

ADD one hour to table times — The tables ignore the clocks changing; you must not. UT + 1 = BST. The almanac marks the convention page-by-page — check it.

Question 3

Doing a secondary-port calculation in summer time, the DST hour is added…

Accepted Answer

At the very END, after all interpolation is finished — Differences are tabulated against UT times. Convert to summer time as the last step — adding it early corrupts the interpolation. Classic exam trap.

Secondary ports

This lesson is part of a paid course