In the tutorial you are calculating (i mean adding and substracting) degrees and minutes just simply as decimals. You measured 42 degrees and 54 minutes not 42.54 degrees. 42 degree 54 minutes is 42.914 degrees not 42.54. This simulation is simply too simple (in celestial simulation) to incorporate such a complicated thing as celestial navigation. I have no idea how you come to right position it is either your or the softwarefault.
You could give the "illusion" of navigation by enabling sextant and you could read your position (lat/long) at the bottom and find it on the map.
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