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TRACKKEEPING (AIPENR1.1)
Tolerances are applied to tracks to assess containment areas for thepurposes
of ensuringnavigational integrity, separation fromother aircraft, terrain and
obstacle clearance, and avoidanceof specified airspace. Although allowing for
theerrors inherent in thenavigation systemsused, these tolerances arebased
on the assumption that thepilotwillmaintain track as closely aspossible.
Thepilot in commandmust, at all times, take positive action to regain track as
soon as a deviation from the correct track is recognised.
AVOIDINGCONTROLLEDAIRSPACE (AIPENR1.1)
When operatingVFR inClass E or G airspace, the following tolerancesmust
be applied to the planned tracks inorder to avoid controlled airspace or
restricted areas.
0-2000AGL
± 1 nm (day)
±2 nm (night)
2,001-5000AGL
± 2 nm (day)
±3 nm (night)
5,001-10000AGL
± 4 nm (day)
±5 nm (night)
Gliders should apply
± 5nm
From 10 001 to FL 200 all VFR aircraft should apply ±8 nm
1 — rul es of the a i r
VFR navigation