Patrol Boats are called upon to defend offshore waters from enemy incursion. During peacetime, this may include interception of illegal drugs while, during wartime, this would include defense of critical waterways and offshore positions that threaten shipping lanes. For the purposes of the GFP ranking, Patrol Craft include various weight classes such as coastal/deep water and missile/torpedo boats.
For the purposes of the GFP final ranking, landlocked nations are NOT penalized for the lack of a standing naval force. However, nations with a standing navy ARE penalized for lack of certain naval assets.
Patrol Craft strength data through 2016.
Sources: CIA.gov, CIA World Factbook, wikipedia.com, public domain print and media sources and user contributions. Some values may be estimated when official sources are lacking.