Nope, not at all.
I think that to a certain degree, you get too many warnings from the sat nav, just to make sure you make the turn.
For instance when on the motorway, it tells you
"Keep right in three quarters of a mile"
"Keep right in half a mile"
"Keep right in quarter of a mile"
"In 400 feet, keep right"
So you'll have plenty of time and distance to sort yourself out.