twisty roads

I assume you mean the Twisty Road Finder files from http://www.twistyroadfinder.com/ and that you are referring to the Garmin Zumo 350 motorcycle GPS. If that's the case, I can see no reason why these files shouldn't be usable on the 350. They are simply GPX files and since the 350 supports the Trip Planner which can use GPX files they should work on that GPS.

I see where searching the Garmin site for Twisty Road results in only 2 references, one for the Zumo 390 and one for the 590 so I assume that is what your referring to when you say "Garmin says No" but Garmin has been known for years to have many inconsistencies in their website so I wouldn't be all that concerned about the 350 not being listed. Comparing the Specs of the Zumo 350 and 390 show there is little difference between the 2 in regards to POI or Trip Planner function.

I see your from St. Thomas. Until we moved to BC my wife and I lived in London all our life's.

Further to my earlier post, I downloaded one of the Twisty Road GPX files and it seems to works fine in the Trip Planner of my Nuvi 3597. It should therefore work fine in the Trip Planner of your Zumo 350LM.

I downloaded the GPX file to my computer and then opened it in a PC program called Tyre (http://www.tyretotravel.com/download-tyre/ ), although I suspect Garmin's BaseCamp software would work just as well. I then used Trye's Garmin function to send the GPX file to the GPS where it appeared as a Trip in Trip Planner. I could then load the Trip and navigate to all the points in the GPX file.

Ken,
Curvy roads is a function built into the firmware on the Zumo 390 & 590. It's an additional method of calculating a route in place of Faster Time or Shorter Distance. IMO it's not particularly useful - but that is because of the way I use the Zumo. I prefer to plan my routes in BaseCamp, selecting specific roads rather than letting the Zumo calculate the route.

No computer or GPS could possibly know what type of roads I prefer better than me.
.

What if I don't like bumpy roads can gps help me?

It's astounding how these are what're called first world problems....

I understand roads only get twisty after one has had a couple too many.

Nuvi1300WTGPS

I have the Zumo 590, and rarely use the Curvy Roads navigation option. It can take you five hours to navigate a route that is normally 2-hours. It avoids interstates and toll roads, and does seek secondary and tertiary roads. Garmin is not perfect with its maps,and there are a lot of unpaved roads it thinks are paved, and curvy roads is a good way to find those. It can be fun if you're killing time and don't care about taking the long way around. It's good for exploring an area and taking roads you've never been on, and wouldn't likely take.

As far as downloading any GPX file for a route, almost any GPS can do that. Like other posters here, I find BaseMap useful for planning trips on back roads, and much more efficient than Curvy Roads.