Jake was born in Antarctica. Arctica - meaning place of bears, from the latin Arctos, bear, and Ant - meaning none, so it's literally the place with no bears. This was good, because Jake was small and would have made a great snack for a hungry bear.
Growing up on the ice was hard. The ice was hard too, but growing up there gave him incredible navigation skills, there being so few natural features to help in the task. Jake would spend many hours of his youth trekking across the snow-covered mountains, wearing nothing but an Emporer Penguin costume made from the Brush Tailed Possum fur, which is hollow-cored (amazing but true) and so extra-warm.
Some other stuff happened then he ended up here.
He built our shed.
He has nothing to do with the maps.