SRTM and Terrain following

Hi,

Does someone know the actual accuracy of the srtm data in the new Mission Planner firmware - 1.62?
'Cause I see there is a big difference (9 Meters in some areas) from 1.52.10 firmware and I want to know if I can trust the new firmware for Terrain following flights in inclined areas.

If someone has a better solution for accurate terrain following flight I’ll be glad to hear.
I fly the drone in California and Brasil, in very sloped areas that can be dangerous if the drone will not follow the terrain elevation correctly.

Any help will be good
Thanks

Maybe a rangefinder would help?

I fly above trees so the rangefinders doesn’t work well.