OSOK 1

Currently supports all BLUFOR sniper rifles except the m109

Pick a weapon or weapon group and enter the correct values in the correct fields and the app calculates you elevation and windage settings on the fly.

You can switch between weapons and make adjustments to the values and the app will recalculate on every key-press.

Wind direction button.
The wind direction button is for when you don't have a kestrel and are guessing the wind strength by the color value of the wind arrow that shows when you press [SHIFT-K]

Yellow, Orange, 3+
Red, 6+
Violet 9+

Just enter a wind value you think might be right and press the wind dir button untill the arrow points in the same direction as on your screen.

To clarify:

The kestrel in the game calculates the crosswind taking wind direction into account and compensating for that. This is also what the wind dir button in the app does.
So if you have a kestrel and entered the crosswind from the kestrel value, don't use the wind dir button.
If you did use the wind dir button anyway, just put it at 0 degrees or 180 degrees (straight up or down) and it will stop compensating. Otherwise you will get a calculation for lower wind strength.

The only time when you do use the wind dir button is when you do not have a kestrel and are basing the wind strength on the arrow ingame [shift-k]. The app will then calculate what the crosswind is (not the same as wind strength). The arrow ingame only shows you at what speed the wind is coming towards you, not what the resulting crosswind is.