Help with custom routes on Nuvi 2555LMT

That's very unusual and not something I've seen raised before. Are you able to post a screenshot of the route displayed in Basecamp?

This is the screenshot from Basecamp. The direction for the loop is counterclockwise. The GPS wanted me to turn left in Cleveland; I continued on the route. It tried to get me to go left again at Ocoee; there are a couple more roads north from the route not shown due to zoom level, but each one we passed it tried to get me to turn left at. After passing the roads it wanted me to turn at, it tried to redirect me back to them until I was far enough past them for the next road to be a shorter alternative.

Thank you for helping.

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Not sure I can help. I can see nothing that indicates why your GPS didn't follow the route you planned. Hopefully someone else may have an idea.

I don't have a solution, just a few ideas that may or may not help.

Something similar happened to me some time ago with a scenic loop. Is the trip still loaded in the GPS? Is the order of the stops correct? ...maybe the route got recalculated by mistake in the GPS?, or maybe you have a different set of avoidances in the GPS?. In my case, the GPS had the toll-road avoidance set (in error) and that created havoc with my scenic route along 17-mile drive in Monterey, CA (a toll road). The GPS kept trying to get me out of there! :)

The only avoidance set that could cause it is Traffic, and it was light that day. Plus, it is a rural area so I doubt there was any traffic broadcast for the area. The map for the route is correct, so the order of the route points is as well. Looking at calculation mode, there are Faster Time, Shorter Distance, Less Fuel, and Off Road. It is set for Faster Time. The first 3 are pretty redundant. The shortest distance will usually result in the fastest time and consume the least fuel. I'm not particularly interested in off-road riding my Harley. Does anyone know what the real difference is in the first 3 options? It seems that all of them will short-circuit a loop route.

If your Nuvi 2555 with Trip Planner routing options are similar to the Nuvi 56, then the device will recalculate BaseCamp created routes, and any recalculations in the device will ignore intermediate BaseCamp route "points" other than full Stops. "Faster Time" routing will typically cause US Interstate Highways to take precedence over nearby parallel lesser roads, unless avoidances work as depicted in your device setup. Practice with two separate out and back routes created on the Nuvi before trying a loop route as difficult as the one you posted for a quicker learning experience. Good luck.

Well it will recalculate but with the apparent via points/shaping points it shouldn't be doing what it is apparently trying. Would be good to see the gpx file but that can't be attached.

@gjhai I've sent you a PM.

@SUSSAMB-
I probably should not have jumped in on this thread without thoroughly understanding the characteristics of both gjhai's Nuvi 2555, my Nuvi 56, and BaseCamp route export files. I do also have a virtually unused Nuvi 255, purchased new with 2010 Garmin Maps, and did decide yesterday not to spring for a small Garmin Oregon 600 handheld touch screen device, at sale prices, just for experimentation. The Nuvi 255 was little used not only because my fingers just were not designed for its touch screen manipulation, but also because I have had a different brand of handheld gps mapping device with real buttons and more features for quite a while.

Frankly, I see little advantage in trying to create routes in BaseCamp for Nuvis with the built in Trip Planner feature, based on my limited testing. I will try to follow your suggestions on use of BaseCamp custom "vias" with the Nuvi 56 however, as it could certainly be useful if all Nuvis honor those custom vias here on the roads in the Colonies. I do need the Nuvi's text to speech instructions more and more after dark as the years roll by.

It is my understanding that the Oregon models can be used without recalculating imported BaseCamp route exports. Thanks, SUSSAMB, for your past informative posts, which I have followed for years on another forum or two.

Actually the current nuvis, and those from 2013 on, work very well with Basecamp, adhering to shaping as well as via points. Unfortunately the 2555 is a 2012 model. You should find your 56 works very differently to your 255.

(thanks for your kind words)

... Looking at calculation mode, there are Faster Time, Shorter Distance, Less Fuel, and Off Road. ... The first 3 are pretty redundant. The shortest distance will usually result in the fastest time and consume the least fuel. I'm not particularly interested in off-road riding my Harley. Does anyone know what the real difference is in the first 3 options? It seems that all of them will short-circuit a loop route.

I also originally (way back in the mists of time) assumed that there would rarely be any difference between the calculation modes. I only have experience with devices which offer Shorter Distance and Faster Time. My experience is that they will seldom yield the same route unless there are very few options in the area.

Shorter Distance will always select the route that is literally the shortest distance.

Faster Time will use the included speed limits (if available) or the road type. If the speed limits are not available in the currently selected map it will assume that the top of the road hierarchy (eg. Interstates) have the fastest speed limits and fewer traffic controls (eg. traffic lights) with lesser categories of roadways having subsequently slower speed limits and more traffic controls. Based on the behaviour I've observed in my Garmin devices and Mapsource/Basecamp, I expect that the Faster Time algorithm also takes other things into account such as avoiding turns and similar obstructions to a faster pace.

The shorter the distance, the more likely you will get the same route with either option. The longer the distance and the more roadways between Here and There, the more likely they will produce different routes.

I can't answer about consuming the least fuel because none of my devices have that option. An educated guess would be that it favours things like slower speed limits, straighter roads, and similar things that could affect fuel consumption. It's not an option that interests me much, in any case. Whether I ride my motorcycle or drive my car I'm almost always in favour of the most interesting route when travelling.

If allowed to come into play, the [re]calculation options will certainly short-circuit a loop route such as your example, as you saw. The trick is to determine what it is on your device that's allowing the [re]calculation mode to come into play. Wish I could help there but my Nuvi 765T in the car and eTrex Legend HCx on the motorcycle still work great so I've managed to avoid the newer devices with the Trip Planner. :)

...ken...