Geebax
Captain
Australia
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Mobiles only have relatively poor GPS receivers, and you are partly correct in thart most mobiles use the cell towers to reduce the time-to-first-fix, but even out of cell range, they still work in a fashion. But a dedicated GPS device like a Garmin is far better at getting a position fix, and far more accurate too.
So if you tether a Garmin to your iPhone or whatever, you should get a really good positional fix, but it is important that the Garmin has a good view of the sky, some people put the RC unit inside a car and drive off then wonder why they lost the drone.
The other possibility is to use Litchi to plan your route off-line then run it in the field.
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