How does it help?
Plan your route as per normal. Enter some wind/weather or let some one do it for you - so you don't know for sure.
Then fly the route as if it were real life. Use DR and map reading. Or just map reading if you want to get au fait with that.
When I used it I din't plan. I set off then made corrections as cross track errors developed.
I used a plane with an autopilot because I can't trim MSFS well enough to fly and navigate. Maybe that's just my machine.
And of course - you can use it for night navigation.
The beauty is there is no fear at all of being taken out by a Tornado and you can switch all your radio nav instruments off without feeling at all uneasy.
