navaid placement - coordinate system

I am trying to make some bgl files wit navaids but i am having problems with the coordinate system, both latitude and longitude.For longitude, we have 2^24 values, given that we have to fill 360 degrees, i get a seconds/unit value of 2.7809. well with this values all is misplaced. Or my math is very bad or there is something im missing.For latitud, its the same but now each unit represents 2 meters (i dont know why the hell did they do it like this). Given that the polar circunference is 40007 km, again aplying math i get 2.3324 seconds/unit. This doesnt work either.thanksmakEDIT got it, my math was wrong doh