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[aprssig] FW: Garmin Rino protocol

Robert Bruninga bruninga at usna.edu
Tue Apr 24 13:23:05 UTC 2007

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
Do let me know, and I'll send it over!
Sandy Pyke

Québec Secours - Commandant - District 10 (Montérégie)

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