The shallows are not shallow enough. The surf breaks on the reefs, so even at high tide they should be within a meter or two of the surface. Running aground in game requires actually hitting the shore I think.
My thought was to create some large arc-shaped objects (large meaning MILES (5-10?) long in a gentle curve) and they can have a texture map of reef stuff. If they were made to break the surface, they'd need a "surf-like" outer texture facing the sea at the water line and above so you could spot the reef from the periscope. The objects could be VERY simple. Do a few types to match longer segments of important reefs like Truk, then reuse them throughout the map rotated as needed.
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