HP 48GX Division by Zero

[Dave Britten]

What about arcsin((n2-n1)/SQRT((e2-e1)^2+(n2-n1)^2))?

EDIT: That just covers 1st quadrant, though. You'd have to figure out signs to get the correct angle. Or better yet, just make the 48 do the work for you.

Code:

\<< SWAP - ROT ROT SWAP - SWAP R\->C ARG \>>

Input:

4: E1
3: E2
2: N1
1: N2

Output:

1: Azimuth