This isn't necessarily related to Pathfinder, as this is intended to a Fate game with homebrew elements to fit the setting I'm creating. If it's against the rules to post anything here not related directly to Pathfinder then I'm sorry, but I'm asking this as I don't know of a larger group of tabletop players from which to pool answers for a solution to my problem.
Said problem as the title says is I'm looking for something that could help me create top down vehicles, some very large, some rather small. Why would you need this in Fate you ask? Well I want to have a constantly updating map to use with Roll20, so everyone has an idea of where they are at any given point, so they don't have to constantly have to scroll back through the chat to remember where they where, and for basic things like line of sight and the complications of getting somewhere in a single "turn" or if they have a line of sight to a enemy.
I won't spoil much but the story will take place on a large "land train" basically a series of massive armored cars being towed through an endless desert non-stop through a desert over the course of a few in-game weeks. Said train will be constantly harassed by your standard post apoc "wasters" who will take with various vehicles, from buggies to "boarding buses" and try to get aboard to fight them.
Which is why I want to have a "battle map" that I can drop in the various cars and what not and have tokens on the represent where everyone is. Anyone know of a free program or trick I could use to make what I'm looking for?