- - submerged ridge that's a boating hazard
- - Sailor's hazard
- - Shallows hazard
- - Hazard to paddle-wheelers
- - Boating hazard
- - Sailing hazard
- - Marine hazard
- - Ocean formation
- - Boater's worry
- - Boat bottom barrier
- - Offshore bank running parallel with the coast
- - Ridge that may bump boat bottoms
- - Bank that may appear in the current recession
- - Where a boat may run aground
- - Sailor's first and second award in marine setting
- - Play area during low tide, perhaps
- - Boater's obstacle
- - Mariner's worry
- - Current creation, sometimes
- - Offshore ridge
- - Barrier that bumps boat bottoms
- - Low tide protrusion
- - Ship grounder
- - Shoreline sight
- - Offshore island.
- - Mississippi obstruction.
- - Ridge in river.
- - Shoal
- - Land line?
- - Navigator's concern
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