Information Interactive Maps (locations of: bonus boards, fast travel boards, influence boards, barn finds, beauty spots, player homes)

[Mave]

Interactive maps are pretty essential when you're trying to find every single (bonus) board.

I've always used https://www.kudosprime.com/fh4/gamemap.php
Another good one is http://swissgameguides.com/maps/forza_horizon_4/world/interactive_map.html

Alternatively you can also buy the Treasure Map: https://www.microsoft.com/en-us/p/forza-horizon-4-treasure-map/ But I don't like spending extra money myself.