compass deviation

noun

1. deviation ( def 4 ).

Example Sentences

For a long time it was hoped that measuring compass deviation and dip would enable sailors to establish their coordinates.

From Literature

The delay had been caused by a compass deviation, which, on account of the slight horizontal intensity of the magnetism of the earth in these northern latitudes, was greater than that obtained during the examination made before the departure of the vessel from Gothenburg.

From Project Gutenberg