While the modding community has already had some solutions to missing companions, Bethesda has officially released their own way to track them. As part of the Vault-Tec Workshop DLC you will get the Vault-Tec Population Management System. It does a number of cool things, but gamers will be excited to hear about the VIP Tracker. With it gamers can search for certain companions and then mark the on their map. You can keep any number of companions tracked for as long as you want. It is not the best way to find lost companions, and there are mods that are significantly easier to use. However, for those that prefer to play their games vanilla this is a great new solution.