Once in control, Dennis will hand you over some cash to buy some weapons. Enter the General Store and purchase a 1911. The store owner will also remind you to activate the radio towers for her to update her inventory. The game will also tell you that doing this gives you free weapons. Next, follow Dennis outside the village and check the sheds to find lootable containers.
Make your way to the nearby radio tower and climb to the top. Don't forget to loot nearby containers and the ones on the tower as you proceed. Upon reaching the top, destroy the scrambler. Use the zip line to reach the ground faster. Now your map will be enabled. Set the waypoint Dennis suggested. Take note that the new weapons you acquired must be equipped and exchanged through the store.