GPX Versions 1.1 vs 1.2 for Garmin Visually Explained

[John S Parry]

@Steve-Jarrell I got out again today to run another test of "Up Ahead", but this time without adding/inserting a via stop into the 1.2 route.

For testing, I created a new 1.2 route to simulate a real situation. When I was few miles from my test deviation, I did the "Up Ahead" thing, selecting the via point to route to. This time, I selected "create a new route" instead of modifying my 1.2 route. I pressed "Go", and my new route started guiding me. I got to the new destination without issue. While stopped, I brought my 1.2 route back up, and it immediately presented the starting point radio box. I selected 'Closest Enry Point", and off I went. Long story short, the remaining route continued exactly as originally planned. Success!

I love it! No skipping waypoints or other stuff you have to deal with on the Next app. I'm now confident I can use 1.2 for just about any situation.

[Steve Jarrell]

@John-S-Parry Awesome!

That makes logical sense (that's not always the case with Garmin) as the 1.2 gpx route has a LOT of gps coordinate pairs in it so when you selected "Nearest Point" it obviously guided you back to one of those points then you were on your way. That's the way that I was hoping that it worked.

Thanks very much for the update!

[Carl Lee]

@steve-jarrell that was a huge typo on my part. It was meant to read “and even if you are not using Tread”. I must have been tired. I’m all Zumo’d out.

[Steve Jarrell]

@Carl-Lee Been there. Done that. Have the t-shirt!

[John S Parry]

@Carl-Lee said:

" I'd like to add something about recalculation. I haven't played with 'Up Ahead' places by inserting them into my route but on a normal deviation from a 1.2 route with recalculation left on, I've found there is a recalculation but it logically puts you back on your intended route - maybe with a u-turn or merging with it a little further along."

This got me thinking about recalculation to get the Zumo to return you to the route. So I had to go out and check.

You're correct that going off route, with recalculation left on, will simply attempt to return you to the route. It does not recalculate the whole route and trash your custom shaping up ahead. I performed conscious off-route deviations at least three separate times, and they all did nothing other than try to return me to the route. A few of the Zumo decisions on returning me were head scratchers, but they worked, and the route continued as normal.

The recalculations that are a NO-NO are actions that modify the route itself. As discussed, that can be through using "Up Ahead" and inserting a new via point as the next stop. Using Search to find a POI and inserting that via point as the next stop is equally disastrous. In short, don't do anything that modifies your route and triggers a recalculation.

From my perspective, using 1.2 GPX files in the Zumo works very well if you understand the behavior.