You need to use a FOB to access the navigation computer

You need to use a FOB to access the navigation computer is a quest in Fallout 2.

Detailed walkthrough
The Tanker FOB located at the Enclave base of Navarro is in the commander's office.

The player character needs to get into the commander's office any way he or she can, which leaves four options:
 * Use force of attack to gain entry
 * Sneak
 * Lie to the guard and simply walk in posing as the cleaning crew
 * Bluff as the duty officer requires it

Afterward, head to the tanker in San Francisco. Go to the lower level of the tanker, and use it to go to the Enclave Oil Rig. Be warned, once you do use it, you cannot come back to the mainland until the game has been completed.

Rewards

 * 5000 XP

Навигационному компьютеру необходима специальная часть для работы