Why use external telemetry module over onboard in FC?

Then you can checkout this Global Satellite Telemetry for ArduPilot , or sort of this kind of comm link for telemetry.

Well, it all depens on the requirement. I think it might cost much :slight_smile:

β€” EDIT

BTW, here is a list for ardupilot Telemetry (landing page) β€” Copter documentation

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