"nospam" wrote

| iphones have a gps, which can show altitude if it's tracking 4 or more
| gps satellites, just as any gps would.
|

A quick look around seems to indicate that the GPS
altitude used in cellphones is not very accurate. I
found this, that shows reasonably good results:

https://www.singletracks.com/blog/gp...dedicated-gps/

But those results are better than what I saw,
with a report varying by 50% in the same spot at
almost the same time.

Google Maps seems to be accurate, to the
extent I've used it, but I've only done limited
testing. I guess it depends on how much accuracy
matters to people. I wouldn't want a photo to tell
me I was on a 200' cliff when it was really 30', but
if one only cares in the 1000' range that won't be
a problem.