Ladjak (meaning "sail" in Chamorro) was a general term referring to both sails woven from pandanus leaves and to single-outrigger canoes ("proas") fitted with a sail. These vessels include the very large sakman (usually known as "flying proas" in historical records), the slightly smaller lelek, the medium-sized duding, and the small duduli. It excludes the panga and the galaide’, which were not fitted with sails.
- Cunningham, Lawrence J.; Kranz, Ward; Sikau, Manny (November 2006). "Restoring traditional seafaring and navigation in Guam" (PDF). Micronesian Journal of the Humanities and Social Sciences. 5 (1/2): 314–319.