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Strategic Lateral Offset Procedures (SLOP)
The SLOP should be Standard Operating Procedure (SOP) for all oceanic crossings. This procedure
was developed to reduce the risk from highly accurate navigation systems or operational errors
involving the ATC clearance. SLOP also replaced the contingency procedure developed for aircraft
encountering wake turbulence. Depending upon winds aloft, coordination between aircraft to avoid
wake turbulence may be necessary. This procedure, which distributes traffic between flying
centerline, 1NM or 2NM right of centerline, greatly reduces the risk to the airspace by the nature of
the randomness. Operators that have an automatic offset capability should fly 1 NM or 2 NM right of
the centerline. Aircraft that do not have an automatic offset capability (that can be programmed in
the LRNS) should fly the centerline only. SLOP was not developed to be used only in contingency
situations.
Hourly altimeter checks
Crews are required to observe the primary and stand-by altimeters each hour. It is recommended that
these hourly checks be recorded with the readings and times. This documentation can aid crews in
determining the most accurate altimeter if an altimetry problem develops.
Approaching waypoints
Confirm next latitude/longitude
Within a few minutes of crossing an oceanic waypoint crews should crosscheck the coordinates of
that waypoint and the next waypoint. This check should be done by comparing the coordinates
against the Master CFP based on the currently effective ATC clearance.
Overhead waypoints
Confirm aircraft transitions to next waypoint
When overhead an oceanic waypoint, crews should ensure that the aircraft transitions to the next leg.
This is confirmed by noting the magnetic heading and distance to the next waypoint compared
against the Master CFP.
Confirm time to next waypoint
Crews must be vigilant in passing an accurate ETA to ATC for the next waypoint. A change of three
(3) minutes or more requires that ATC be notified in a timely manner. There is substantial emphasis
on reducing longitudinal separation and this timely update must be a priority for the crews.
NORTH ATLANTIC MNPSA OPERATIONS MANUAL CHAPTER 12
NAT MNPS 78 Edition 2009
Position report
After passing over the oceanic waypoint, crews that give a position report to ATC must use the
standard format. Flights designated as MET reporting flights or flights on random routes should be
including in the position report additional items such as winds and temperatures. Crews should also
note and record their fuel status at each oceanic waypoint. This is especially important if the cleared
route and flight level differ significantly from the filed flight plan.
10-minute plot
Record time and latitude/longitude on plotting chart
Approximately 10 minutes after passing an oceanic waypoint, crews should plot the latitude,
longitude and time on the plotting chart. It is advisable to plot the non-steering LRNS. A 10-minute
plot can alert the crew to any lateral deviation from their ATC clearance prior to it becoming a Gross
Navigation Error. A good crosscheck for the position of the 10-minute plot is that it is approximately
2° of longitude past the oceanic waypoint.
Midpoint
Midway between waypoints
It is good practice to crosscheck winds midway between oceanic waypoints by comparing the Master
CFP, LRNS and upper millibar wind chart. As noted before, this information will be included in a
position report if the flight has either been designated as a MET reporting flight or is a flight on a
random route. This crosscheck will also aid crews in case there is a need for a contingency such as
Dead Reckoning (DR).
Confirm time
It is recommended that during a wind check the crews also confirm the ETA to the next waypoint. A
change of three (3) minutes or more requires that ATC be notified in a timely manner.
Coast in
Compare ground based NAVAID to LRNS
When departing oceanic airspace and acquiring ground based NAVAIDs, crews should note the
accuracy of the LRNS by comparing it to those NAVAIDs. Any discrepancy should be noted in the
Maintenance Log.
Remove Strategic Lateral Offset
Crews using a Lateral Offset of 1NM or 2NM right of centerline at oceanic entry need a procedure to
remove this Lateral Offset at coast in prior to exiting oceanic airspace. It is advisable to include this
as a checklist item.
Confirm routing after oceanic exit
Before entering the domestic route structure, crews must confirm their routing to include aircraft
speed.
Note: Crews experiencing loss of communications leaving oceanic airspace should follow State
guidance as published in AIPs.
Descent
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