World-Wide Navigational Warning Service
... that the World-Wide Navigational Warning Service divides the entire ocean into just 21 radio areas?
... that the <b id="mwAh0"><a href="./World-Wide_Navigational_Warning_Service" id="mwAh4" rel="mw:WikiLink" title="World-Wide Navigational Warning Service">World-Wide Navigational Warning Service</a></b> divides the entire ocean into just 21 radio areas?