I am not the best at visualizing distances, so I find having the objective marker enabled very helpful, but especially when driving long distances from one objective to the next, I wish I didn't have the pin marker cluttering up the scenery. I'd love to see an intermediate option added, where the marker appears when the player reaches say 2 km from the objective. It would still be there in rapid starting and stopping operations, but not be blocking part of the view when transiting long distances, only appearing with enough warning to to prepare to brake smoothly.
It would help if you could define where it appeared or move it on the screen. Has a nasty habit of obscuring signals on gantries too.
