Reply to post: Trident

Blighty: We spent £1bn on Galileo and all we got was this lousy T-shirt

Robert Sneddon

Trident

The Trident missiles don't use GPS since they spend their time underwater a lot and GPS signals don't penetrate seawater very well. In flight after launch they use an internal inertial guidance system and in space at the top of their ballistic trajectory they use a star tracker system for final course changes before their descent to glory.

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