Definition
When a charted object bears exactly 90 degrees from the heading, the position line runs at right angles to the course, so distance off measured by radar range, vertical sextant angle or an earlier doubling calculation completes the fix at once. It is a strong cut with minimum plotting effort and a natural moment to log position on a coastal passage. The special case of 22.5 degrees then 45 degrees on the bow gives distance run equal to distance off when abeam.
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