A route within defined limits inside which two-way traffic is
established, aimed at providing safe passage of ships through waters where navigation is
difficult or dangerous.
.9 Recommended route
A route of undefined width, for the convenience of ships in transit,
which is often marked by centre line buoys.
.10 Recommended track
A route which has been specially examined to ensure so far as possible
that it is free of dangers and along which ships are advised to navigate.
.11 Deep water route
A route within defined limits which has been accurately surveyed for
clearance of sea bottom and submerged obstacles as indicated on the chart.
.12 Precautionary area
A routeing measure comprising an area within defined limits where ships
must navigate with particular caution and within which the direction of traffic flow may
be recommended.
.13 Area to be avoided
A routeing measure comprising an area within defined limits in which
either navigation is particularly hazardous or it is exceptionally important to avoid
casualties and which should be avoided by all ships, or certain classes of ship.
.14 Established direction of traffic flow
A traffic flow pattern indicating the directional movement of traffic
as established within a traffic separation scheme.
.15 Recommended direction of traffic flow
A traffic flow pattern indicating a recommended directional movement of
traffic where it is impractical or unnecessary to adopt an established direction of
traffic flow.
