The idea of sunstones as a navigational aid was first raised in the 1960s, but historians rejected the theory because of a lack of archaeological evidence.

Completed in 1860, it remains a navigational aid, nightly casting its beam beyond the dangerous shoals of the inlet.

The airport had a radar system installed, but this was used solely for monitoring traffic and was not seen as a navigational aid.

The plane remained there for 64 years, earning its nickname, and the wreckage was used as a navigational aid.

In the late 17th century a lead-covered dome (cupola) was added to the castle's stair turret as a navigational aid or daymark.

Most pass safely through the seas, dodging or outrunning the worst kinds of weather and equipped with state-ofthe-art navigational equipment and back-up generators.

Nowadays it provides hi-tech nautical navigational equipment.

He's enterprising enough to patch up the hole, but water damage to his navigational equipment means that he finds himself in the path of a devastating storm.

Navigational equipment or local knowledge are required for this route.

The reconstruction includes extending the runway, installing new aero navigational equipment and repairing the terminal building.

It lost only five seconds, a navigational error of one nautical mile.

The wreck was determined to be the result of navigational error.

A navigational error may also have contributed to the accident.

A possible cause was a navigational error or a mistaken target, as one of the pathfinders on the raid later recounted.

However, there was no evidence to suggest that radio failure or navigational error were responsible for the disaster.

Critically, the ship did not have a chronometer for this voyage, a comparatively new and expensive navigational instrument at the time.

Although the stone was found near a navigational instrument, its use remains uncertain.

A pelorus was a navigational instrument used on sailing ships.

Controversially, the ship did not have a marine chronometer on board, a comparatively new and expensive navigational instrument that would have enabled her to determine her longitude accurately.

Examples of their navigational instruments are found in the museums of a number of countries.

She said that the birds with greater influence may be those with better navigational skills.

These navigational skills seem to require no prior life experience.

Meanwhile, ever-increasing numbers of adults blithely outsource their navigational skills to apps.

Most blame their poor navigational skills.

This then raises the question of 'the cognitive and technological abilities for the construction of watercraft and the planning of open sea-crossings' requiring some navigational skills.

The new method focuses on cells in the brain that function as a kind of internal navigational system.

Toothed whales, including dolphins, can hear ultrasound and use such sounds in their navigational system (biosonar) to orient and capture prey.

Monarch pioneered all-weather operations in its service area by installing its own navigational system.

During the 1960s and early 1970s he developed a time-based navigational system with passive ranging, circular orbits, and space-borne high precision clocks placed in satellites.

The navigational system also employs two floating antenna buoys to receive radio-messages, target destination data and satellite navigation signals at great depth.

His only navigational tool was to look out of the window from the corner of his eye at the horizon.

They were an extremely useful navigational tool.

It was used in those times as a navigational tool for incoming ships.

The accompanying site used a novel navigational tool which presented each item in the broadcast as an element in a timeline view.

Customizable key bindings, a navigational tool which allows users to assign hotkeys to their choice of options in both the menus and the toolbar.