Hack Watch

From Wikipedia, the free encyclopedia

A watch used on a ship's deck when taking astronomical sights for navigational purposes. Accuracy can be checked by comparing daily with the ship's marine chronometer. The use of a hack watch makes it easier to take sights as the chronometer is normally in a fixed position in a ship - below decks and in gimbals to keep it level.

This article does not cite any references or sources. (March 2007) Please help improve this article by adding citations to reliable sources. Unverifiable material may be challenged and removed.