The wise pilot will not stray far from the marked channel; he would either lose position or fall into the power of the Hole.

It struck the bridge near its western edge, far from the marked channel, which runs through the middle of the bridge's span, officials said last night.

The other marked channel ran 25 miles to the south-east, and skirted the western side of Hanish al Kubra.

Beth, we have to stay in the marked channel.

There are over 1,864 miles (3,000km) of marked channels, which vary in depth between 6 and 14ft (1.8 and 4.35m).

They chugged out of the little harbour, keeping to the marked channel until they were well clear of the coast.

But the tanker strayed to the right of navigational buoys and out of the marked channel.

Yet, the oyster boat had come from a marked channel.

Boats can only use a narrow marked channel through the broad; they are discouraged from using the broad during the winter months because of the breeding season.

There are numerous moorings and many boats distributed around the area along with a clearly marked navigational channel.