This Bonus Board can be found near the location shown on the map below. This Bonus Board will be hung from an electricity tower. Simply hitting it will reward you with 5000 XP.

For the vast majority of Forza Horizon 5 players, however, the Treasure Map DLC probably won't be worth it. FH5 does a great job surfacing Bonus Boards as you get near them anyways, and exploring ...

You can locate these boards on the map of Forza Horizon 5 by pulling out the map looking for the Bonus Board symbols. You can use the in-game filters and only tick the Bonus Boards to locate them ...