Should I just tell my players when they're lost?
I'm getting ready to run my first hexcrawl and I'll be doing it in 3.5e. However I'm unsure how to handle the rules of getting lost with my players. We're playing on a VTT and I was gonna use fog of war to unveil the map hex by hex. However if the circumstances call for and they fail a survival check and get lost I'm not sure how to handle it. In the rules they move to a random hex (I was gonna roll d6 and move in any direction except intended), and until they pass another survival check or hit a landmark the PCs do not know they're lost.
Since they're not making their own maps I kind of just figured I should just tell them since while it's meta info, they have no power to control it anyways until they pass the realization check. They can just roleplay the discovery once they have.
But I'm not sure if this is robbing my players of the surprise (but possibly also frustration) of ending up somewhere they shouldn't be. I feel like this would be further enhanced by them making their own map, but am unsure how to handle them getting lost, since all their hexes would be wrong and it would eventually lead to book keeping while they sort it out, slowing down the pace of the game.
Any thoughts on this? How do you normally run hexcrawls online?