Order 7110.65P, Air Traffic Control, with changes

2/19/047110.65PSection 5. Offshore/Oceanic TransitionProcedures8−5−1. ALTITUDE/FLIGHT LEVEL TRANSITIONWhen vertical separation is applied between aircraftcrossing the offshore/oceanic airspace boundarybelow FL 180, control action shall be taken to ensurethat differences between the standard altimetersetting (QNE) and local altimeter setting (QNH) donot compromise separation. (See FIG 8−5−1.)FIG 8−5−1Standard and Local Altimeter Setting Differencesb. The aircraft are horizontally radar separated andseparation is increasing at the edge of known radarcoverage.8−5−3. OPPOSITE DIRECTIONWhen transitioning from an offshore airspace area tooceanic airspace, an aircraft may climb throughopposite direction oceanic traffic provided verticalseparation above that traffic is established:a. Before the outbound crosses the offshore/oceanic boundary; andb. 15 minutes before the aircraft are estimated topass. (See FIG 8−5−2.)FIG 8−5−2Transitioning From Offshore to Oceanic AirspaceOpposite Direction8−5−2. COURSE DIVERGENCEWhen aircraft are entering oceanic airspace,separation will exist in oceanic airspace when:a. Aircraft are established on courses that divergeby at least 15 degrees until oceanic lateral separationis established, andOffshore/Oceanic Transition Procedures8−5−1