Rev. Feb/14/97

The formulas above are applied in 'wind.exe' showing that an accurate deviation table is a must when a compass is used to calculate wind speed and wind direction. Below is a typical result of wind.exe:

Vpres = 108 .............Vgps = 120 ....(km/h)
Acomp = 90 ............ Agps = 90 ..... (degrees)

Compass error.........Wind speed.......... Wind direction
-9 ........................... 22........................ 218
-8 ........................... 20 ....................... 221
-7 ........................... 18 ....................... 224
-6 ........................... 17 ....................... 228
-5 ........................... 16 ....................... 233
-4 ........................... 14 ....................... 238
-3 ........................... 13 ....................... 245
-2 ........................... 12 ....................... 253
-1 ........................... 12 ....................... 261
0 ............................ 12 ....................... 270
1 ............................ 12 ....................... 279
2 ............................ 13 ....................... 287
3 ............................ 13 ....................... 295
4 ............................ 14 ....................... 302
5 ............................ 16 ....................... 307
6 ............................ 17 ....................... 312
7 ............................ 18 ....................... 316
8 ............................ 20 ....................... 319
9 ............................ 22 ....................... 322