[aprssig] On-Star

Scott Miller scott at opentrac.org
Wed May 6 00:15:37 EDT 2009

How hard is it to physically tap into the Onstar GPS?  I wouldn't mind 
doing a translator if there's a demand for it.  I just bought a vehicle 
tonight myself, but it's a Nissan.  My Honda got totaled a couple of 
weeks ago - my tracker actually got a packet out a couple of seconds 
after I got hit, when I'd slowed down to 14 mph but hadn't managed to 
get out of the lane yet.

If anyone has suggestions on antenna setups for a Nissan Pathfinder that 
won't interfere with putting stuff on the roof rack, let me know.


Dave Baxter wrote:
> I thought I had read much of that before.  A very similar article was on
> the Hackaday site a year or so back.
> The biggest single issue, is that as the article here etc says, if you
> switch the Onstar's GPS from MotoBinary mode to NMEA, the vehicle's on
> board Onstar system error's.
> No doubt someone could "do" a single chip Atmel/Pic or whatever, to take
> the MotoBinary data, extract what's needed for APRS, and then spit out
> NMEA strings for our needs, leaving the on board OEM systems happy and
> unconfused.
> Or, perhaps a "special version" tracker that is happy with the Motorola
> Binary format and does the APRS thing indipendantly.  No need for a
> D700/D7/D710 etc then, probably take the unmodified data (no need for
> RS232 conversion) too.
> Just musing...
> 73.
> Dave G0WBX. 
>> -----Original Message-----
>> From: Kent Hufford [mailto:khufford at atlanticbb.net] 
>> Sent: 03 May 2009 13:09
>> To: 'TAPR APRS Mailing List'
>> Cc: W1JD at mindspring.com
>> Subject: Re: [aprssig] On-Star
>> http://members.cox.net/onstar/
>> Kent
>> KQ4KK
>> -----Original Message-----
>> From: aprssig-bounces at tapr.org 
>> [mailto:aprssig-bounces at tapr.org] On Behalf Of JD Delancy
>> Sent: Sunday, May 03, 2009 8:06 AM
>> To: aprssig at tapr.org
>> Subject: [aprssig] On-Star
>> Has anyone successfully interfaced the Kenwood D700 with 
>> General Motors' 
>> On-Star ?
>>    jd
>> >   
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