I had a Garmin one and in the settings put that I was a HGV so it would avoid the narrow roads, having said that I did end up in a couple of farmers fields lol always plan a route with a map n pen n paper then use sat nav as a backup
I have a TomTom with their Camper Maps and it works perfectly OK. However, you have to think of a sat nav as an aid, always best to check the route against a map.
there are many posts on here about satnavs, I had a Tom Tom with the camper map on it and never had aproblem with routing however it died duing our last trip in July so ordered a Garmin Camper760 it sounded like the dogs bits, well although we haven't been away with the van since july I use it every day in my job as a service engineer and I have had issuses with it wanting to send me down grass lanes, I had a Garmin years ago and near where I live it always routed me via a layby going past the Royal hospital in Chesterfield, many years on my new Garmin still wants to take me down the layby. I much prefer the Tom Tom, Hind sight is a wonderfull thing,
Plot the route on a map to avoid scary country lanes. Thats always worked for me in 40odd yrs of driving. Am I the only one who dosen't really get satnavs? I hate anybody or anything telling me where to go when I'm driving.
I didn't "get" sat navs before we got one, preferring instead my "sat beside me nav". But we got a Tomtom a few years ago for a trip to France when the dragon decided she was fed up navigating. After using it in France we were sold! It really was brilliant.
Since then I've switched to doing various driving jobs and have purchased a bigger Tomtom which I use on a daily basis for work - when I was multi-dropping it proved invaluable for finding customers addresses in strange areas all over the country.
But you do have to use a bit of common sense when using one - there have been some occasions when I've over-ruled it, "no way, I aint taking the van down there"! You know your vehicle's dimensions/limitations and particular narrow or low or weight restrictions are usually signposted at the entrance to a road so you just avoid going down that road if your vehicle doesn't fit, you don't just blindly follow the satnav.
Now we have the motorvan I'm not bothering to get a camping/caravanning/truck special one, on the basis that I can take a van down pretty nearly anywhere I can take a car (have had to for work) and I'm happy I can usually assess whether I can get down a road the satnav is showing me before I'm committed.
Yes, I can see the value as a tool for commercial drivers finding delivery addresses. In my truck driving days I carried a cab full of A to Z city maps for UK, Falkplans for Germany and so on so satnav would be modern equivalent of that but reading threads on here and also talking to younger drivers it seems many have no concept of travel except by following a satnav, they don't actually know where they are in relation to anywhere else.
I have always enjoyed long distance route planning using maps so I know where I am at all timess and reading threads on here on gets the impression that it is the satnav in control not the driver. A good small example, I plotted a route to a campsite in deepest rural France but when I reached the turning the campsite was signposted straight on which I followed as obviously direct route was not suitable for caravans. Later another UK couple reached the site complaining they had been stuck for an hour on a single track rd blocked by farm equipment. They had followed the satnav, not the signpost.