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A surfer has no means of self propulsion at all. He is completely reliant on sea currents. A thrown pebble is basically a projectile so it has no means of self propulsion either.
Just saying that sea-faring will probably be better if you don't use a boat type. It makes for a useful safety feature in case full flight capability has been disabled but you can't really expect to hit speeds that flying IS can due to water drag.
Rather than an actual boat that drags itself over the ocean, maybe you're referring to something like a swamp rover or hoverboat. Makes contact with the water but only on a surface level while in motion so as to minimize water drag.
Then again rethinking it, the density required to practically float over the water has to be veeery low compared to water. Practically air light. So battleship is the only way I can imagine the Igel.
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