Long Range Telemetry system for use in Europe

I’m trying to build an UAV for operation at sea, and with a max range of 200km. Is there any telemetry system that i can use for these conditions?
It is supposed to “land” at the sea for data measurements, so i know that a LoS telemetry system is not viable. I tried to search for 4G and wifi telemetry systems, but i dont have enough background of this area in terms of reachable range.
Is there any viable solution?

Thanks,
GC

What kind of bandwidth?
Sat phone is the only viable option for reliable 2 way comms.

A SPOT tracker is a cheap option for one way status reports.

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@ogulbrandsen has done something similar. He might have a tip or two.
Other then that, not sure how far ut cellular range out on sea…
If official network doesnt work, i would think low bandwidth to be the best option and a flight hight around 500m for it to work.


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any particular reasons it has to fly to the destination?
I’m thinking boat drone and simplex low bandwidth communication.

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