Reduced visible area needed to spot

[Daft Loon]

Currently ~1/2 of a ship needs to be visible in order to spot it. Reducing this to 1/4 or so might remove some instances of can see, can't spot behind clouds.

Anyone have an objection to being spotted based on slightly less of the ship sticking out from behind a rock or know if it doesn't work that way as far as cloud spotting.