Except O'Leary Mountain, before you can use them you must first clear the nearby ambush camp or get inside the NERO mobile medical unit and grab the NERO Injector. Once you do this you can use the option to fast travel to these places or can also sleep here to advance time.
Aspen Butte Ambush CampBare Bay Ambush CampBear Creek Hot Springs Ambush CampBelknap Caves Ambush CampBerley Lake Ambush CampBlack Crater Ambush CampCascade Lakes Railway Ambush CampCascade Radio Tower Ambush CampChemult Community College NERO CheckpointDeerborn Ambush CampHorse Creek Ambush CampHorse Lake NERO CheckpointIron Butte Pass NERO CheckpointJefferson Rail Tunnel Ambush CampLittle Bear Lake NERO CheckpointMarion Forks Tunnel NERO CheckpointO'Leary MountainOld Pioneer Cemetery NERO CheckpointOld Sawmill NERO CheckpointPillette Bridge NERO CheckpointRedwood RV Park Ambush CampRogue Tunnel NERO CheckpointSantiam Tunnel NERO CheckpointSpruce Lake Ambush CampSpruce Lake NERO CheckpointVolcanic Legacy Scenic Byway NERO CheckpointWagon Road Ambush Camp