It does not need a 'VNAV' cruise entry - it uses current altitude. I was told it computed the 'direct to' vertical profile with no allowance for heading or turn radius, but that could be wrong - as I said, I never used it. If that is the case, the only time it would be meaningful would be when you were on that track, so I would wager that '2000ft high' would be just about perfect..That is why the 'un-executed' route was always more accurate as it 'drew' the turn.