That seems way off.
If you google earth that crash area and see eye view the elevation shows 1,565ft.
https://earth.google.com/web/@35.55070981,-98.54566407,476.37454527a,6178.26056539d,35y,359.60221527h,0t,0r/data=OgMKATA
Now we all know the flightaware mode c data is shown at 29.92. So if it fell off of the map at 1700ft reported alt on a 30.44 baro set day, the best he could have been was actual MSL alt of +476.2ft or 2176 ft (msl)
MSL from elevation equals AGL. 2176-1565ft= 611ft. AGL.
U can check the math here.
https://www.weather.gov/epz/wxcalc_pressurealtitude
There was a lowering of pressure going on also to consider. High to low look out below.
The baro was steadily falling that day and into the next day.
I think rising terrain coupled with a falling baro and a failure to increase alt and hold a cruise alt of only hundreds of feet above ground level may have caused this accident.
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