Where not specified nationally, distances off land are usually 12 nm.
In restricted waters, horizontal clearances of 5nm are accepted.
National requirements for minimum distances off coasts for transits are observed:
- South Africa – Routes keep 25nm off the coast for transit purposes, except through the Traffic Separation Schemes (TSS) off Alphard Bank
- West Coast of USA – Routes keep 50nm off the coast for transit purposes
- New Zealand – Routes keep 5 nm off the coast for transit purposes
- Routes off the East coast of Australia keep outside the Great Barrier Reef then approach the coast via either the Palm, Hydrographers’s or Grafton Passages
- Elsewhere the transit routes keep 25nm off the coast, except when using the TSS in the Bass Strait or when transiting the Torres Strait
- Baltic – Vessels entering the Baltic from the North Sea are routed via the ‘T’ Route, East of Leasoe Island and via the Great Belt.
- Norway – The offshore TSSs are used for transit routes. There is also a coastal route for transit between Norwegian ports, and an option for obtaining distances using the inshore Indrelia route.