[aprssig] FW: Garmin Rino protocol

Wes Johnston, AI4PX wes at kd4rdb.com
Tue Apr 24 08:47:08 CDT 2007

I think the trick would be to simply record the polling message and clean up
the wav file (in this case).  I gave up trying to decode on air (not that
the 600baud signal is that difficult, it was more of a time issue), and use
use a "dummy" rino110 in our comms trailer hooked to an external antenna.
It hears all the local rinos and a script downloads the waypoints every 10
seconds and looks for the changes.  Any changes in waypoint position cause
that waypoint to be forwarded to an xastir server port.

I have some rinos and can play however.


On 4/24/07, Robert Bruninga <bruninga at usna.edu> wrote:
> Anyone want to continue with the RINO-to-APRS project?
> -----Original Message-----
> From: spyke555 at yahoo.ca
> Sent: Friday, April 20, 2007 3:16 PM
> Subject: Garmin Rino protocol
> ... I recently found your article on the Garmin Rino on-air
> protocol and found it most interesting. I was just wondering if
> you are still interested in persuling this at all?
> I've been looking at your recordings (both test and wav and
> found an algorithm that does a descent job at deciphering the
> peaks from the noise.
> My interest is somewhat different that yours though. You see I
> already have the GPS and the FRS radios, just looking to make a
> circuit that turns the two into a Rino of sorts. Yes I am aware
> there are trackers and anti-trackers that are currently
> available that will do essentially the same thing and then
> some... But I'm trying to do this as inexpensively as possible,
> and the simplicity of the Garmin on-air protocol does appeal to
> me as it would be very easy to implement in a PIC or similar
> device both for sending and receiving.
> At any rate, I've developed a little program that allows you to
> create your own wav files with control of every bit in the
> message. The thought here is that if one were to braudcast this
> out via an FRS radio, the Rino's listenning should decode and
> respond. Thinking this may be an interesting way to further dive
> into the protocol, assuming of course that the check-sum (if
> any) is not critical for accepting the message...
> My problem is that I don't have a Rino myself, so can't test
> this on my own... So I was wondering if you still had any
> interest in this and if you would be willing to try out the
> application?
> Do let me know, and I'll send it over!
> Sandy Pyke
> ----------------------------------------------------------------
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In theory there is no difference between practice and theory.
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