Hey Mr BoDangles,
you can use this values to calculate your next point
Latitude | N-S radius of curvature | Surface distance per 1°
change in latitude | E-W radius of curvature | Surface
distance per 1° change in longitude
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
0° 6335.44 km 110.574
km 6378.14
km 111.320 km
15° 6339.70 km 110.649
km 6379.57
km 107.551 km
30° 6351.38 km 110.852
km 6383.48
km 96.486 km
45° 6367.38 km 111.132
km 6388.84
km 78.847 km
60° 6383.45 km 111.412
km 6394.21
km 55.800 km
75° 6395.26 km 111.618
km 6398.15
km 28.902 km
90° 6399.59 km 111.694
km 6399.59
km 0.000 km
you can also consider this values too.
1° ≈ 111 km (110.57 eq’l — 111.70 polar)
0.01° ≈ 1.11 km
0.0001° ≈ 11.1 m
1′ ≈ 1.85 km (= 1 nm)
1″ ≈ 30.9 m
So in you case you need to add or subtract 12.75"W (Seconds ) from you
first Long. Value
Keep in Mind this value will change for N-S Lat.
Let me know if it works :)
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