History of US Freedom of Navigation Operations
These maps show freedom of navigation operations conducted by US Navy vessels, in order to challenge maritime claims that the US interprets as inconsistent with international law, as listed by the US Department of Defense.
These maps show FONOPs conducted by US Navy vessels to challenge maritime claims that the US interprets as inconsistent with international law.
Researchers: Aaron L. Connelly, Michael Coyne. Digital Design: Erin Harris.

Source: US Department of Defense Annual Freedom of Navigation Reports.
All years are US fiscal years and start on 1 October of the previous year and end on 30 September of the given year.