spawn 3 random vehicles/bots/ships.
then make a screenshot of the map overlay ( dunno if that is possible )
Get the ship map and replace red with a rgba(0,0,0,0) and green with rgba(0,0,255,1)
blue or rgba(255,0,255,1)
purple if the map has acid.
Vehicles : replace green with rgba(0,255,0,1) = green
Bots : replace green with rgba(255,255,0,1) = yellow
AT only : replace green with rgba(255,0,0,1) = red
no draw the partially transparent ship map over over the at-only map, the bot map the result, the vehicle map over the result.
Now you got a colored map where some water is colored for vehicles and bots.