Thanks. I'll read through that thread.
I'm pretty new to all of this. I took my 6.5 CM Tikka to a 900 yard range the other day (first time shooting anything past 100 yards), and a guy walked me through how to calculate dope on a Kestrel. It was a blast and I got a first round hit on the 900 plate after confirming zero at 100. I've been messing around with the Applied Ballistics app on my phone since. I'll be taking that rifle on a hunt next week, but I'm not sure any of these variables will make much of a difference at the max 2-300 yard ranges I expect.
But about that, in Applied Ballistics, it looks like Density Altitude auto-updates whenever I click the wifi-looking icons below Temp, Humidity, and Pressure (I assume the app is pulling data from a local weather station).