Is SLOP permitted on North Atlantic Random Routes?

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c100driver

Random routes are any route that does not pass through 30 West along the full length of the track during the hours of operation.

Day-time OTS 1130 UTC to 1900 UTC at 30°W
Night-time OTS 0100 UTC to 0800 UTC at 30°W

So any aircraft flying full length of the track but passing through 30W outside of these times is outside of the organised track system and is therefore random routing.

Also T16 and T9 are random routes.
Another possibility is an aircraft leaving or joining the organised system before or after the end of the track. Say a flight down to Florida which may start on the track but turn south before the end.