@Steve-Jarrell @carl-lee @marinus-van-deudekom First, thanks for the conversation. I get passionate about this stuff, so sometimes I hit back harder than I should. In my defense, this is my hobby. I love studying maps and their relative behaviors. With due respect, sometimes things are said/implied by "experts" that have no basis in reality and are simply accepted as the gospel by many. In my experience, the value of using "HERE" as a base map for import to Garmin devices is one of them.
The route below is a very recent example:
[image: 1786021941695-2fe09775-1f04-47e1-8fa2-2a3971fdf49e-image.jpeg]
The black line shows the HERE map route line. You can clearly see with an OSM overlay that the route section around WP#7 is significantly off from where the physical road actually exists. In other words, it's a HERE cartography error that really screwed up running the HERE version of the route. I'd like to say this is the first time I have encountered this kind of HERE error, but I can't. In any case, if you're interested in the details, you can review the topic:
https://forum.myrouteapp.com/topic/11297/another-erratic-routing-incident?page=1
I won't rehash much of what I've already said. But in short, HERE (to me) has too many deficiencies to trust as a base map for Routeplanner development. There is a laundry list of other serious HERE problems I could list but won't do here.
I'll finish by emphasizing that there is too much fear of non-HERE route development. In addition to using OSM in Routeplanner, I also develop routes using a Mac Desktop planner called inRoute, which is completely Apple Maps based. I can export a GPX from inRoute, import it into a Garmin GPS, and have 100% confidence that everything is OK. Again, proven over years of development using that platform. It comes down to having the right mix of shaping points for an accurate recalculation on the Gamin side.
From a cartography and GPS coordinates point of view, I'll take OSM or Apple based maps every time over HERE. This is all from personal experience and not conjecture. As always, I want to learn and if there is something I'm missing here, I'm all ears.