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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.