Objective: The authors describe the epidemiology of infirmary chief complaints aboard a collegiate maritime training ship. Participants: They assessed patients (N = 646 visits) evaluated by the "USTS Enterprise" medical department during a 44-day sea term from January to February 2007. Methods: The authors conducted a retrospective chart review of infirmary use and extracted information on age, sex, rank, chief complaints, and frequency of visits. Results: Overall, 646 visits were made. The most common complaints were dermatologic (30.1%): rash, skin infection, laceration, and sunburn. Together, ear, nose, and throat and dermatologic complaints accounted for 57.6% of all visits. Work-related complaints accounted for 12.5% of recorded visits. Compared with the ship population, senior and female cadets had more visits than the average. Port departure days were typically the busiest. Conclusions: Among healthy, college-aged cadets at sea, typical primary care constitute comprise the majority of visits. (Contains 2 tables and 5 figures.)