A glider is an efficient tool for oceanographic observation capable of autonomously recording data while diving and traveling hundreds to thousands of kilometers on predetermined routes. Starting in 2008, gliders began visiting Station ALOHA, deployed by the University of Hawaii School of Ocean and Earth Science and Technology. Between one and three times a year, one of the three gliders that frequent Station ALOHA is sent out, staying on average three months. The gliders measure and record similar data to that which is acquired on Hawaii Ocean Time-series (HOT) cruises - temperature, salinity, optical data and more - except at a shallower depth and over 3 consecutive months rather than 4 consecutive days. The sea gliders have the capability to reach to about 1000 m but generally only dive to between 300 m and 500 m, concentrating on the upper 200 m of the ocean.