Do you think that a person in a boat should be calling OCS at the start? The boat would be floating at the far end of the starting line, 150 to 200 feet away from the bell, which is onshore.
Since sound travels at slightly more than 1000 feet per second, OCS would be called based on the positions of the boats about .15 to .2 seconds after the sound of the bell as heard by the RC member working the start box and the competitors who are standing onshore. An excellent legal start might be called “over early”.
One opinion would be that I should not ask this question on the discussion group, but I think it is something that needs public clarification.