Included are warnings about navigational hazards, and changes to standard navigation charts.

Ships missing in a particular area, perhaps a new navigational hazard... anything?

What remains of the site is marked as a "navigational hazard" on sea charts.

To assist the ships, 14 lighthouses were built at various navigational hazards along the river.

Others have been removed as navigational hazards or are still being salvaged for lumber.

Wouldn't want it hanging in space, being a navigational hazard.

The shields were treating the landing pad as a navigational hazard to be avoided.

In fifty-three minutes, the station will be a debris field and navigational hazard.

The Red sea is full of navigational hazards, but at that crucial time, reliable charts were not available.

A space elevator would present a navigational hazard, both to aircraft and spacecraft.