If you get the
The Field Density Altitude Compensator (FDAC) and a wind meter that does wind and temperature you should be good to go, right?
what about this?</div></div> You need corrected or raw barometric pressure where you are at. Once you get that then you can use the FDAC.
A good atomospheric instrument on site will help when it comes to calculating long shots as data relayed over the radio can be hours old and change a lot by the time you make your shot. It can also vary from location to location.</div></div>
You can use just the Temp if you know your current altitude the FDAC has the graph to calculate the DA from just Temp providing the altitude is known.
In fact a wind meter with just a Casio, Suunto or other watch with basic atmospheric information will work. Along with the FDAC of course.
I zeroed and doped a new Rifle at RO yesterday and the FDAC using the 2700fps card was dead on at most ranges and within a 1/10th of a mil at the few odd ranges, its a great powerless tool for field use.