[aprssig] Nuvi messaging

Scott Miller scott at opentrac.org
Fri Feb 1 19:04:28 CST 2008

The Tracker2 (either the OT2m or T2-135) is the only APRS device (to my 
knowledge) that handles the Garmin binary protocol at all, so you're 
going to need one of those for starters.

You'll also need a cable (https://buy.garmin.com/shop/shop.do?pID=1449) 
to connect it.  No promises on 100% compatibility with the 650 yet, 
since I've only tested the 350.  Maybe I'll pick up one of the bigger 
ones to demo at Dayton.  That's the thing about Dayton - if I don't feel 
like packing it up and bringing it back, I can just slap a 'discounted 
demo unit' sticker on it Sunday and be rid of it in short order.  =]

I haven't released any updated firmware to support the fleet management 
interface yet, but maybe I'll post a beta by the end of the weekend. 
The 350 did display waypoints just fine without any firmware changes, 

For the record, the cable needs to be wired to a DB9 female - yellow to 
pin 2, white to pin 3, black to pin 5.


The Bland Ranch wrote:
> OK Scott....how are you making all this magic happen?
> I have a NUVI 650 and would like to use some of thee features with my APRS
> stuff.
> Chuck
> Quoting Scott Miller <scott at opentrac.org>:
>> How cool is this?
>> http://n1vg.net/images/nuvi-inbox.jpg
>> I got the Nuvi into fleet management mode, and it adds menu items for 
>> messaging.  Shown here is my D7A sending a text message to the T2 (via 
>> an old Alinco DJ-F1T that's not shown).
>> Here's the messaging menu:
>> http://n1vg.net/images/nuvi-messaging.jpg
>> And the message composition screen:
>> http://n1vg.net/images/nuvi-compose.jpg
>> It's going to have to take a destination callsign in the message text, 
>> though.  I think I'm going to make the default behavior to be 'reply', 
>> so if you don't include a destination, it'll just send the message to 
>> whoever sent the last message it received.
>> And when I get a chance, I'll see about tying it all into the T2's 
>> command processor, so you can reconfigure it from the Nuvi's message 
>> interface.
>> For the receive side, I think this beats the D700/D710 for usability 
>> already.  When you tap a message summary, you get a whole page to view 
>> the text (200 characters max, I think) and it's a very clear, 
>> daylight-readable display with a simple interface.  Can't wait to try it 
>> out on one of the big StreetPilots.
>> Scott
>> N1VG
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