When using tide tables to predict times and heights of tide at a "secondary port", what must be done with the information given for that secondary port?

A. Secondary port predictions can be read directly from the standard port table with no adjustment

B. The listed time and height differences (corrections) for the secondary port must be applied to the standard port's predicted times and heights, interpolating as necessary for intermediate states of tide, to obtain the secondary port's tidal predictions

C. The secondary port corrections only apply to neap tides, never springs

D. Secondary ports never have tidal predictions and must be estimated by eye from the chart alone

A. A third bearing is required by law for every fix taken

B. A third bearing is never useful and only wastes time

C. Two bearings give a position at their intersection, but a third bearing forms a small triangle ("cocked hat") where the three position lines meet — the size of this triangle gives a visual indication of the likely accuracy of the fix and any compass error, helping the navigator judge how much to trust the result

D. Three bearings always cancel out all errors and produce a perfect fix

A. 3/12 of the range

B. 1/12 of the range

C. 1/2 of the range

D. 6/12 of the range