Yeah, that's a boat wake. Unless those are the front and rear paddles of a plesiosaur!
They're not, though. It's a boat wake (according to me).

Someone may have just spotted the Loch Ness Monster, and all it took Apple Maps to find it. Yes, that's right, the same Apple Maps who gave us these mind-bending geographic glitches that resulted in landscapes bending like Paris in Inception. Small submarines haven't been able to find it (although they heard something close on radar, and maybe they saw a fin!), hydrophones haven't been able to detect it (except for possible clicking noises like a dolphin and a swishing noise like large fins being paddled!), 1500 years of looking straight at the water have proved inconclusive, and even its Wikipedia page is a morass of dubious citations or entries with no citations at all.

Sources: ABC News | Apple Maps