Transit (Navigation)

The observed alignment of two charted or identifiable objects from a vessel.

When the nearer and farther objects lie on the same bearing, the vessel is on the straight line through them. A charted transit can mark a channel centreline, clearing line or position line, while an uncharted pair can provide a useful repeatable reference.

The objects must be identified correctly and their alignment interpreted in the intended order. A transit gives one line of position rather than a complete fix and does not by itself confirm depth, along-track position or freedom from moving hazards.

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