@Carl-Lee "What I will stand by is that GPX1.2 is way more forgiving of MRA planning errors than GPX1.1. A very quickly put together MRA route planned (with or without via points) on HERE and transferred with 1.2 always seems to calculate and run whereas 1.1 needs a lot more attention to detail. And like I said, just my experience but I'm always open to new ideas."
You are 100% correct. It's a fact that a route created in the Garmin using the 1.2 format is FAR more likely to follow the route that's shown in MRA than one created with the 1.1 format unless you use a LOT of shaping points.
But why would you? I gave a couple of very clear examples of this at the beginning of this post.
Using the 1.1 vs. the 1.2 format to create the exact route that you planned in MRA in the Garmin, regardless of the map layer, is very tedious and requires that you send the route to the Garmin, let it create the route, then double check it against the track to ensure that it's what you planned in MRA.
I used 1.1 and did it this way many times until I understood exactly what the 1.2 format was how it works. The 1.2 format was created specifically to address this issue and allow you to create a route with far fewer shaping points while ensuring that the route precisely follows the track that you intended.
Here's another interesting fact that I learned just today. My Garmin XT3 actually uses HERE AND OSM mapping data. I have no idea when it uses either one, but it doesn't really concern me as I just want my route to follow my intended track as closely as possible, that the 1.2 format does that the best for me.
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