[aprssig] APRS and Garmin Nuvi
Scott Miller
scott at opentrac.org
Fri Feb 1 10:49:43 EST 2008
I would suspect that any of the models listed here might be made to
work, but I wouldn't promise anything:
http://www8.garmin.com/solutions/pnd/supportedproducts.jsp
And how do you pry what open? The only thing I'm planning to pry open
is the circuit on the cable, which looks like it's a welded plastic
shell - not an overmolding, hopefully.
Scott
N1VG
Wes Johnston, AI4PX wrote:
> DO you think this would work on the 260? I know someone who just got
> one. Also, how do you pry the little critter open?
> Wes
>
> On Feb 1, 2008 1:18 AM, Steve Noskowicz <noskosteve at yahoo.com
> <mailto:noskosteve at yahoo.com>> wrote:
>
>
>
> In case you didn't know, Garmin has the complete Nuvi interface
> protocol spec
> on their web site. I got a 750 and saw reference to their
> interface 'cable'
> and I downloaded the spec. I was curious, but just glanced at it
> since I don't
> plan to get into USB just yet.
>
> 73, Steve, K9DCI
>
>
> --- "Greg D." <ko6th_greg at hotmail.com
> <mailto:ko6th_greg at hotmail.com>> wrote:
>
> >
> > Wow, I wonder if this would work on the other Garmin USB-based
> GPS's? I see
> > it's not listed for their service, but I have a eTrek Vista HCx
> in the mail,
> > due for delivery tomorrow. I figured I would have to keep using
> my GPS-III
> > (with the display going out), or pick up a simple serial GPS
> module and put
> > it in a plastic box, for attachment to my Kenwood D7. Instead,
> maybe this?
> >
> > Does the cable have a standard mini-USB end on it (the small
> kind), or is it
> > something special? If standard, then they must be emulating a
> USB host in
> > there, because there aren't any extra pins on the connector to do
> anything
> > other than USB.
> >
> > Greg KO6TH
> >
> >
> > > -----Original Message-----
> > > From: aprssig-bounces at lists.tapr.org
> <mailto:aprssig-bounces at lists.tapr.org>
> > > [mailto:aprssig-bounces at lists.tapr.org
> <mailto:aprssig-bounces at lists.tapr.org>]On Behalf Of Scott Miller
> > > Sent: Thursday, January 31, 2008 11:01 PM
> > > To: TAPR APRS Mailing List
> > > Subject: [aprssig] APRS and Garmin Nuvi
> > >
> > >
> > > I discovered something interesting today. Here I've been
> telling people
> > > all along that the newer USB-only Garmin receivers like the
> Nuvi are
> > > worthless for APRS. Turns out I was wrong.
> > >
> > > When I heard about Garmin's fleet management interface, I
> decided it'd
> > > be worth checking out. It needs a special cable, though - for
> the Nuvi
> > > 350 I picked up, it's Garmin p/n 010-10813-00. By the looks of
> it, it's
> > > probably just got a level converter inside, but I'm not sure.
> > > Apparently there's a serial interface of some sort that can
> share the
> > > USB connector.
> > >
> > > The fleet management protocol looked suspiciously like a subset of
> > > Garmin's regular binary serial protocol, so (once I figured out the
> > > cable pinouts and soldered on a DB9) I fired up the test
> program I'd
> > > written, and sure enough, it spit out a list of supported
> protocols.
> > >
> > > I plugged it straight into a stock Tracker2 and the activity light
> > > started blinking green, showing a good fix. I piped in some
> recorded
> > > APRS traffic and the map screen started showing APRS stations.
> Here are
> > > some pictures I took (haven't tried the screen capture program
> yet):
> > >
> > > Map screen (2D mode): http://n1vg.net/images/nuvi-map.jpg
> > > Waypoint list: http://n1vg.net/images/nuvi-list.jpg
> > > Station detail: http://n1vg.net/images/nuvi-detail.jpg
> > >
> > > It's not perfect - the waypoint set is different, for one. You
> can see
> > > that all of the cars are now up on lifts with the hood up! The
> digis do
> > > show up as antenna towers, at least, and the houses are there.
> I'll
> > > have to find out if it'll take custom symbols. Also, it seems
> to have
> > > some quirks about showing waypoints at different zoom levels.
> > >
> > > The Nuvi 350 has a USB port on the side and another one on the
> clip-on
> > > base, so you can power it and plug it in to the tracker at the same
> > > time. When I find out how the serial interface adapter works,
> I'll see
> > > if I can power it from the tracker, or maybe vice versa. I'll
> also see
> > > about a cheaper substitute for the cable - this one cost me $30
> after
> > > shipping. It probably wouldn't be hard to build an equivalent
> circuit
> > > into a DB9 shell.
> > >
> > > The bad news is that the Tracker2 (at least the OT2m version)
> is totally
> > > sold out right now. My only two spares are going out for CE EMC
> > > certification shortly. The factory producing the boards is
> snowed in
> > > right now and hasn't even been able to get the parts for the
> next batch
> > > - DHL's had them sitting at the depot for days. It'll probably
> be the
> > > end of February before I have any more. The T2-135 (for the Alinco
> > > DR-135) is shipping, albeit slowly due to limited production
> capability
> > > here. (The Tracker2 page has moved to
> > > http://www.argentdata.com/products/tracker2.html if you're
> looking for
> > > more information.)
> > >
> > > Hopefully by the time the boards come in I'll have figured out
> all of
> > > the Nuvi's quirks and dealt with them. I also hope to make
> some use of
> > > the fleet management interface for some new features. Most
> importantly
> > > - it does text messaging.
> > >
> > > Scott
> > > N1VG
> > >
> > >
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> > >
> > >
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>
>
> --
> 73, Steve, K9DCI
>
>
>
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