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I don't think you have a recalc the route option on the phone. You can make the app draw a route to you to some given address (it automatically syncs it to the device) but it's pretty shit in that regard. To do a proper route you'd have to whip up Komoot / RWGPS (the mobile apps...) and make the updated route there and sync that (which involves tethering the phone) and it all needs decent connectivity too, especially if you have lots of routes in various services like I do, as the 3rd party "Sync" option will sync each and every one and it's kind of slow even with good home broadband. So rather than all the fiddling roadside I always opted for a quick zoom-out and find my way to the route that way, of course as mentioned above that might be pretty hard in city traffic with all the no-go zones and one ways.
I'd go for the Roam for the auto-routing, but if the budget is limited the Bolt is livable with (would be PITA in an unknown urban env). The maintenance closures/diversions aren't a problem with the Roam as you miss the route it will keep recalculating and give you the next alternative.
Compared to the Roam.
That's what I was worried about, going off the beaten track etc.
If you do go off track, could you not just get your phone out and recalculate the route? Or is it not that simple?
If you had the choice of either, would you go for the roam or bolt?