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LEADING MARKS and TRANSITS are usually fixed navigation beacons set up by the local harbour authority or harbourmaster, as part of their royal charter responsibility. By
keeping the marks in TRANSIT or on a set BEARING , the approaching vessel stays in safe water.
EXAMPLE DARTMOUTH, Once again , the plan view of the chart looks easy. In practice, the problem is IDENTIFYING where the harbour and it’s marks are.
Once the LEADING MARKS have been IDENTIFIED , keeping them on the correct BEARING will even counteract TIDAL SET and DRIFT