The Kahana is a supply vessel common to offshore oil fields such as those in the Gulf of Mexico, the North Sea, and offshore Nigeria. This type of boat is used to ferry food, water, stores, and drilling necessities like "liquid mud" to oil drilling platforms. This type of ship is generally built for speed and not duration, so the last port of call is likely close to the destination. However, it appears to have been modified for the specific task of finding the Island, and has two helipads on the deck where the boat would normally carry pallets of supplies. It was equipped with two helicopters, but one crashed into the ocean when Naomi parachuted onto the Island, and the other crashed into the ocean after the Island moved. ("Catch-22") ("There's No Place Like Home, Part 2")