@Marinus-van-Deudekom unless I'm missing something, what you're pointing to is "Off-Route Recalculation". This setting only comes into play when you go off-route and the XT wants to know how to proceed.
So are you referring to off-route, or another generic setting to turn off recalculation completely?
If you set, Main Screen Settings,Navigation. Route Recalculation to Off.
That doesn't prevent the route being recalculated. It only prevents it from being recalculated automatically if you go off route.
The route will still be recalculated if you press Skip, for example.
Or if the map on the Zumo does not match the map in Basecamp - it will recalculate on transfer and on load.
Or if any of the settings in Basecamp ticked
Or if you change the routing preferences , vehicle type, or avoidances while the route is loaded.
So if you use MRA for routing it will recalculate in the Zumo XT as you are not using the same map as is held in Basecamp or your unit. To mitigate this I import GPX 1.1 Route +Track and enable the track and the route and put additional shaping points in the route to get it to match the track if required. I use the option of Recalculation Prompted. This means if I wander off route I can wander back as long as I can see the magenta line. Guidance goes silent if you do this but it resumes as soon as you are back on the line and I have the option of recalculating as well
@Mzokk Yes to all you outlined. 
The only recalculation you have any control over is off-route. Otherwise, as you pointed out, recalculation happens based on any number of variables. Certainly, it always happens on transfer and on load, and nothing can be done to prevent it.
For off-route, I usually have it set to Prompted, but lately, I have it Off. When I develop a route, I know my intended minor deviations and how to return. I found that prompted can be very sensitive to the smallest changes, even down to what lane I'm in on a wide US interstate. Sometimes it gets annoying clearing the screen. But of course, that's all personal preference.
@Marinus-van-Deudekom unless I'm missing something, what you're pointing to is "Off-Route Recalculation". This setting only comes into play when you go off-route and the XT wants to know how to proceed.
So are you referring to off-route, or another generic setting to turn off recalculation completely?
