What was used to plan the route?
RidewithGPS.
Did you upload the "track" file?
I uploaded a TCX file and ran that course.
What maps are installed on the device?
Open source as recommended by DCrainmaker's site.
Was "recalculate" on (it shouldn't be)?
No. Not on, just checked.
Are you saving the data to the sd card (seems to be preferrable)?
I am not aware of saving any data. If saving data is a problem with the unit, I can live without it but would have no idea how to disable this functionality. I only want accurate non-jumpy speed readings, time, HR, and 150 yard warnings before all turns. Elevation and grade are nice and getting a display of total elevation gained would also be nice.
I think I might have determined part of the wrong routing. Each time the mis-routing would send me on a smaller, parallel tiny road or onto a dirt path. I found a setting that was "Off road" and I just put it to "On Road"
The first set of freezes happened at around 75 miles into what should have been an 186 mile ride. The last set of lockups were probably at 180 miles but I am not sure of my total distance since I cycled for quite a patch with it non-functional. I only had two routes on the 8 gig card. I had only ridden maybe 20 miles before this ride. It is hard to fathom why it could not handle the data or why I would need to stop and reset it mid-ride. I have driven thousands of miles non-stop with my auto Garmin and it never behaved this way. It also froze on a little training ride. One of the crazy freezes was when I stopped at the Milford Bakery. When I came out it after a lengthy stop, I had a hard time starting it and now presume it was locked up because I had to power off and on a few times. When it came back to life, it told me I was off course when I know darn well that I was on course since the bakery was a stop. Then it told me that it found the course (I was not familiar with the route as I download someone elses hilly training ride). I was a bot surprised it sent me across the river. About 15 miles of hills later in Bucks County, I started to question if I was not doing the "Hilly" Covered Bridges course now. Sure enough, I was on another course. The only common point that I could see was the Milford Bakery. Good thing I had the double latte and a large donut.
With respect to the color and nature of the arrow. I do not know. I did once notice another line on the parallel road that I knew was the wrong road and therefore did not take it. I might need to put down more waypoints but I read that the 800 can't handle too many.
Thank you very much for your very thoughtful support.