navigational aid
navaid

The light is still in use as a navigational aid.

Much attention has been focused on the fact that a key navigational aid was out of service for maintenance.

But in an earlier era, the light was a much-needed navigational aid.

The helicopter was not equipped with a more advanced navigational aid system.

Most birds use the direction of the sun more than any other navigational aid, and so need a very reliable time sense.

"We had a 90-foot schooner with every modern navigational aid," he said.

In another, she helped mark water towers with town names as a navigational aid for pilots.

They are working to restore the lighthouse, which is still an active navigational aid.

This feature was a navigational aid for airliners of the time.

"I know that's just a navigational aid, but it's probably sending contact reports to that base. "

Skepticism is truly a required navigational aid when seeking information - on the Web or in any media.

The light was reignited in 1945 and has served as a secondary navigational aid ever since.

Today it is the oldest standing navigational aid of any kind in the United States.

The lighthouse was officially discontinued as a navigational aid in 1933.

During the 19th century the island was used as a navigational aid to ships sailing into Liverpool.

Woodford Island is often visible from every point on the lake, making it a navigational aid.

It is the oldest surviving navigational aid on Hailuoto island.

He described it as a common navigational aid for sailors, so the compass must have been introduced to Europe some time earlier.

The light was established in 1906 and serves as a navigational aid for the Vortrapptief channel.

It was intended as an air navigational aid.

Even our inland water ways offer navigational aid to barges gratis.

The 187-ft bell tower also serves as a navigational aid for boaters on the lake.

There is a navigational aid on the top of South Page Island.

The lighthouse, besides being a navigational aid, serves as an important automatic weather station.

Its 165-feet spire was a navigational aid for sailors.