GoldenEye 007/Frigate

Disarm engine room bomb
Upstairs in the engine room, you should be able to see the bomp on top of the comupters. Select the Bomb Defuser and press the fire button to disarm the bomb.

Plant tracking bug on helicopter
At the front of the ship is a helicopter. Go to your invintory and select the Tracker bug. Aim at any part of the helicopter and press the fire button to plant the Tracker bug. You only have one so don't miss.
 * Notes: After planting the Tracker bug it is possable to shoot it off again causing you to fail the objective.