GPS formulas

I have been looking for formulas to help me create a special GPS device, I
need to know distance from current position to a point (LAT,LONG) and also I
need a function to let me know when I am passing by a point and if its to
the left, right, ahead, or behind me, and it would be nice to know by how
much.

Now for the distance I have used successfully:

And for nearing I have used reather unsucessfully:


.

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