I created a short route on Basecamp 4.3.5 using the CNNA 2015.10 map and the Automobile activity. It looks perfect (19.2 miles). Running Win7.
If I use Basecamp and simply drag the route onto the Internal Storage of my Montana to transfer the route, the route is horribly messed up when I try to load it on the Montana (56.1 miles). Note: Montana is set to Automobile activity as well.
HOWEVER, if I manually export the route from Basecamp as a GPX file and then manually copy the GPX file to the internal storage on the Montana (Garmin\GPX folder), the route will load fine.
So I compared the two GPX files (one manually exported, the other created by Basecamp on the Montana) and they are very different. The exported one is much larger and has many more RouteExtensionPoint elements in the XML.
Can someone please explain why Basecamp can export a GPX file that works, but doesn't create the exact same GPX file when you drag a route onto the Montana to transfer it? And why is broken?