Mariners are advised to use other methods to determine their position, particularly when navigating close to the shore or in the vicinity of dangers. BUOYS AND BEACONS Buoys and beacons marking the Suez Canal and approach channels may be temporarily removed, displaced or changed because of dredging or other operations. BEACONS IN THE SUEZ CANAL The 9.0 metre depth contour throughout the canal is marked at varying intervals by charted buoyant beacons. MOORING BOLLARDS, With the exception of Great Bitter Lake, mooring bollards are placed on both sides of the canal.