Think K boat with a little less power but a little larger with a shallow v bottom.
All other circle boats run 5 lap or 5 mile races. GNs run 2 -10 lap races on Saturday and one 20 lap final on Sunday. the other inboard circle boats start running on the water usually with a green flag but sometimes a countdown clock where they can't cross the start line before the clock hits zero.
GNs start on the beach with a dead engine. Flag drops, and they start and go. Damn thing better start FAST!

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