4WD vehicle (or the use of a vehicle during the night)
Quad bikes (or the use of quad bikes early in the morning)
Handheld GPS
Handheld VHF Radios
Walkie Talkies
Binoculars (especially night vision binoculars)
Projector and screen
Torches
Mobile phones (unlocked)
Tape measures
Buckets
Dive slates