Commons provides consistently named categories with basic information on vessels, many of which don't have Wikipedia articles yet. Several "by" subcategories of Category:Ships allow to find vessels (and images of vessels) with different criteria.
Participants aim to identify ships by name (20,000 by now), year of completion (97%), flag, type/function, IMO or ENI, country of construction (58%), etc. The 20,000 categories include ca. 100,000 images in their main category. 33% of these images are used at Wikipedia.