[aprssig] Waypoints to GPS Receiver: Navigation

Scott Miller scott at opentrac.org
Mon Aug 27 21:48:30 CDT 2007

If you're describing the condition where new waypoints get numbers added 
to the end, then that's a Garmin bug (feature?).  Some models do that 
when receiving NMEA waypoints, but not when receiving Garmin waypoints. 
  That's why the T2 in Garmin mode doesn't exhibit the problem.

I have to hand it to Magellan for making a really seriously simple 
waypoint input protocol.  Theirs is based on the NMEA GPWPL format, but 
extends it with altitude, symbol, comment, and a couple of other things. 
  Garmin does more, but each Garmin model (and different firmware 
revisions for the same model) take different formats and have different 
(unpublished) restrictions on what characters they take and what they'll 
do if they don't like a waypoint name.  All of the Magellans just work, 
they're not picky about special characters, they're accepting of what 
they can't display, and they have large comment fields.  Their symbol 
selection sucks, though.

At least Garmin seems to be settling on a smaller number of formats in 
their newer units.  Not counting the panel-mount aviation line, which 
uses an entirely different protocol...


Keith VE7GDH wrote:
> Scott N1VG wrote...
>> Guess I'll have to provide some 24x24 symbols as well.  Did you turn
>> on the CUSTSYM option on the T2-135?  On the units I've tested,
>> those symbols show up in place of the ones that are by default just
>> blue dots. You *should* be able to chose them for waypoints.
> I know it shouldn't take too long to get a connector on the end of the 
> cable
> from the GPS, but I probably won't get to it for another couple of days 
> or so.
> I'll turn CUSTSYM on and try it out when I have the cable ready.
> I've been chatting with a friend that has a D7. He tried connecting his 
> 60CSx
> but he ended up with a new waypoint every time a position report was heard.
> The T2-135 was a lot more civilized when I tried it with a 76S. One 
> waypoint
> per station instead of a whole set of "breadcrumbs" from many waypoints 
> from a
> moving station. I don't know if there's a setting in the D7 to prevent what
> I'm describing, but that's what my buddy got when he tried it.
> 73 es cul - Keith VE7GDH
> -- 
> "I may be lost, but I know exactly where I am!"
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