I have used it, but normally I use the Gaia GPS app. Been using that for the past 4 years in Colorado, Idaho, and here in Kentucky. That app has never let me down. I also carry a regular compass just in case.
On a side note, I did loose my iphone the other day while deer hunting. Logged into icloud on my son's phone and used the lost phone feature. My phone was on silent, but the icloud has a feature that made my phone ring allowing us to find it without a lot of drama.
