I live in Western Australia and I go Bush "outside the City" Australia is 7.6million square kilometers and Western Australia is 2.6 million square kilometers of that so one could get lost when you off the main roads "and many have "so knowing what App you use is important, I am very proficient with GPS maps both Electronic and transferring to paper Maps for the members that wish to join us, I can get you within 4 meters of any info on a Paper map " so long as there is a Co-ord system on the Map"
So it doesn't matter what you use ,but you need to be aware of other backups IF all fails "Electronics that is"
We had such a day the Temp was over 40c and the vehicle Aircons where having a problem" that can happen if the breeze is from behind" and our devices locked up due to Temp and we had no GPS support at all, but we knew exactly where we were because we where aware of our location from paper maps and experience.
Mags