Open sea navigation on a tidally locked moon

On a tidally locked gas giant moon (which is otherwise earth-like - see this question for pictures) how would medieval sea navigation techniques differ from Earth?

I presume that compared to Earth, navigation would be easier on the side facing the planet but how exactly will it be done? Would it help if the gas giant has recognizable features like Jupiter's Red Spot? What about the dark side where the gas giant is not visible?

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Open sea navigation on a tidally locked moon

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