I am on a full lap of Germany with two friends, using routes between overnight stops and routes for days out that I created. When I created the routes and ran the routes, I used:
1. A Mac
2. BaseCamp
3. A Nav V GPS device
4. The last but one set of maps. The new maps came out just before I left but I didn't load them
I create my routes in motorcycle mode in BaseCamp
In BaseCamp on my Mac AND on my device I have ALL the settings / pretences (whether in car mode or motorbike mode) set identically. These setting / preferences are set to: Avoid U-turns, avoid unmade roads and use the fastest time. I have off route recalculation set to prompted; in other words I (and not my device) will choose whether to allow a recalculation.
We are now some six nights into our jaunt with a total distance covered since leaving home of about 1,000 miles. Of that distance, I woukd guess that about 450 has been on motorways (basically Calais to Lubeck) and 550 (Lubrck > Stralsund > Ruglsnd > Straksund > Berlin) on a good mixture of major, intermediate and minor roads. In short, a pretty good work-out for the routes' creation, their transfer to my device and their subsequent running. I am happy report that everything has behaved faultlessly.
My two friends I shared my routes with also have Macs running BaseCamp but are using the latest Garmin based maps. They are both using the latest generation Garmin GPS devices, the equivalent of the Nav V, I forget the model number. Besides their maps being one generation younger than mine, their Mac and their devices' preferences are set up differently to mine. They set theirs up as:
A. In car mode: Allow motorways, avoid U-tuns, avoid unmade roads, fastest time
B. In motorbike mode: Avoid motorways, avoid U-turns, avoid unmade roads, fastest time
As you'll see, besides the basic one generational difference in the maps, there is one very fundamental difference in the pretence set-up.... The avoidance of motorways when in motorbike mode.
Our first little journey was from Calais to St Omer, a short hop straight down. I created this route by the very simple method of highlighting the Chunnel exit and hotel points in BaseCamp and asking the software to create me a route between them. In short, a route A to B. BaseCamp created it, based on my preferences, straight along the motorway for about 20 minutes, then into St Omer's streets and to our hotel's front door. Happy with this, I did not bother to add any shaping points of my own. My device ran the route faultlessly. My two friends did not turn their devices on, so we have no way of knowing what theirs might have done.
On the second day, it was a straightforward motorway bash St Omer to Arnhem, in Holland. Again, I created this route A to B, with no shaping points in between; I was happy with the one offered up by BaseCamp on my Mac. My device ran it perfectly. My two friends ran my route their devices but it ran very differently. Theirs kept them off the motorway, not surprisingly as their pretence setting was always to avoid motorways in motorcycle mode. An easy thing to spot and work out why.
For the next day, again it was a motorway bash A to B, Arnhem to Hamburg. My friends, realising the the settings problem switched their two devices from motorcycle mode to car mode, which allows them - according to their settings - motorway usage. In theory, this should allow them to follow my route A to B. It didn't, it still wanted them to come off the motorway, despite their transport mode being car, which in their preference settings, allows motorway usage. I was stumped as to why. It was very unlikely to be the generational difference in the maps, their car setting (albeit used on a motorbike) allowed motorways, so why didn't their two devices follow my simple A to B route? Suddenly a light came on in my head.....
As I have all my settings, whether I am in car mode or motorcycle mode, set identically on my Mac and on my device (see above). I always create all my routes - whether for use in the car or on my bike - in motorcycle mode; as there is no difference in my settings, I might as well just leave it all in motorcycle mode. This appears on my Mac as a motorbike symbol against the route name. My friends' devices, despite being in car mode (which allows motorways) picked up that the route had been created by me in a motorcycle mode. Their devices, re-set the route according to their motorcycle preference of avoiding motorways, overriding the car mode setting they had selected, with the inevitable result.... Their two devices routed them off the motorway.
Once I realised what was happening I simply altered both their devices' preference settings to the same as mine and all has been well ever since.
Of course it is easy to criticise Garmin for allowing such fundamental alterations to occur. But, that ignores the value that preference settings allow individual users (who have spent a lot of money, we are often reminded) to tailor their devices to suite their very personal tastes; see lots of posts on 'I always set my device to avoid motorways, who wants to use motorways?'. Similarly, it is easy to critisise me for not putting shaping points along the motorway to force a shared route along. But, that ignores that to me, the creator of the simple A to B route, it looks fine. It also ignores that, between however many shaping points I might have put in, my friends' two devices would very probably have still routed them away from the motorway between the points if it were at all posdible.
So, chaos, before blaming every fault on expensive Garmin devices (and on BaseCamp) look to your settings and pretences first.
PS Once we had all three devices set the same, everything has gone really well with my two friends' running of all my routes. Mine, on my device, has worked well from day one anyway. Just one tiny difference now exists between us. Occaisionaly, their devices might route them down a slightly different road, for instance taking the first on the left in a town not the second. I suspect that this us nothing more than their maps sometimes being very slightly different to mine, which allows their devices to make a slight amendment.