Guys I am a complete newbie so excuse the obvious questions. 

I fly fullsize and also large scale gliders and there are a few steps on this path but can I start with the simple one please.

Can someone guide me on setting up a simple RF downlink to send GPS data from the scale aircraft to the ground and displaying the realtime position of the glider on a tablet or smartphone please?

I have looked at 3DR Compact 915MHz 500mw Bluetooth Box Radio Telemetry Module. Will this work? Can I connect a GPS without the Autopilot gear?


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no it will not because you can not connect a GPS directly to a telemetry TX :)

To send GPS coordinates down to ground, you need a GPS receiver antenna, than a processor device like Ardu pilot or Pixhawk that can convert raw GPS data into something meaningful inside the plane and than a telemetry transmitter to send that data back to the ground.

You have a number of challenges:

As a scale glider, you are probably going far out and flying near hills so you need a strong TX.
New additional weight is a problem for you unless your gliders have props get some added lift.

That said, and if your budget allows you buy some gear easily I would go with a complete all in one neat solution rather than piece part solution :)

can you first tell me why you need GPS coordinates ONLY?

He can connect i.e. M8N GPS receiver via radio link to PC running uCenter and control position from ground.

Marvin - not clear on your proposed solution. you mean connect GPS receiver directly to telemetry TX (would probably requires some re wiring for +5V power).

I am not familiar with Ucenter. will it translate raw data from GPS to meaningfull lat long details on gEO map etc.?

If yes than your proposed solution is simple and fits his needs.
Found one quick tutorial link on Ucenter. Looks interesting

Simple but worth considering :-)

PS. Pls, "Martin", not "Marvin" ;-)

Your first name appears as Marcin for some reason so not even Marvin which my iPad auto corrected neither MARTIN :)

yes worth considering but you better test it first as I have feeling the person who asked the question Has no experience with wiring, GPS software etc.

I've tested it before, both with NMEA and proprietary uBlox binary protocol - all works fine if you'll set correct baud for radio link.

But the question was asked over a half year ago and I'm not sure if is still valid...

Yes still looking for a solution. And a software solution too.

A bit more on the application itself. This is not an autopilot application (but it might take on elements of this later). Glider racing involves flying a glider around a usually triangular course with the RC pilot doing the flying without assistance so the idea is to transmit the GPS data to a display that is with the pilot guiding him/her from waypoint to waypoint.

Rob, first check uCenter with direct connection to GPS unit, if this will sufficient for you. Than you can use radio link to connect this unit remotely.

Take a look here:

This uses 3DR radios direct to GPS module, should do what you want it to.

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