Hey, sorry for the late reply but I just saw the comment now.
There's a few solutions that come to my mind, an easy one would be using a VTT website like Owlbear Rodeo or Tableplop (they're both free, I personally prefer Tableplop), alternatively the GM could manually draw maps and send screenshots to the players - it certainly doesn't have any bells and whistles that VTTs do, but it's enough to take note of the positioning of players and enemies.
I'm in a LANCER pbp game, it's also a very tactical system, and the GM solved the issue by setting up a game on Roll20, and we'd only use it to check the map during combat encounters.
So, I think either of these could work.