Well, in the real world latitude doesn't have anything directly to do with thermal layers. Currents are much more important in that regard, and no, the game does not model any sort of real variation in thermal layers. It's always a set number at a given depth that serves as a static modifier to detection probability; naturally the shallower it is, the better.
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There are only forty people in the world and five of them are hamburgers.
-Don Van Vliet (aka Captain Beefheart)
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