GPS unit

But it gives me coordinates like this: 5936.681N, 547.789E

Easy way to get 59.611344,5.796477 ?

Well, set out in long-hand:
5936.681 * 1000 = 5936681
5936681 / 100000 = 59
5936681 % 100000 = 36681
36681 / 60000 = 0.61135