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GPS for an ultra-runner

Hello everyone,

(Sorry for my bad english, I'm trying to be as clear as possible.)

I am looking for GPS systems that work otherwise than with mobile phone (in altitude, we lose the phones signals). The goal is for an ultra-marathon (Bromont Ultra, a race of more than 30 hours), we must know at all times where our rider is, if he follows the track and tell him where to go in real time.

- We must be able to load a route (GPX), loaded by us (where the rider is, where he must go).

- We must be able to be precise at ~10m. near.

- We must be able to transmit the position of the runner to a base (screen), we are in radio communication (CB) with this base.

- A system that transmits satellite signals (longitude - latitude - altitude), not mobile phone signals.

- Need two systems that work in parallel in case one of the two breaks. Can one system harm the other?

Is it all possible? I really need your advice, I know nothing about GPS. ;)

Thanks for your help ! We look forward to hearing from you! :)

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