Maybe I found a little bug with GPS. E.g. 27 deg 45' 21.60" N, 15 deg 34' 48.00" W is the same as 27.756 -15.58 (Canary Islands). If you enter -15.58 (minus!) _and_ _W_ I get 0, if I enter 15.58 (positive) and _W_ it is ok. Shouldn't there be a preference for the value, since it defines already the reference and therefore the reference be ignored?