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I am not surprised - my clue was very faint. Eureka was a WWII transponderslant
system that delayed and replied to airborne interrogations, so that a
distance reading could be found by an airplane - the aerial voyager inoff
question.
TACAN - Tactical Air Navigation - is a military pulse system that
provides bearing and distance from a beacon. The FAA - Federal Aviation
Administration - preferred VOR - VHF Omni directional Range - an analog
bearing system instead, but used the distance finding element of TACAN as
civil DME - distance measuring equipment.
Now, the serious cost of all these navaids - VOR DME ILS (Instrument
Landing System), LORAN (Long Range Navigation), NDB (Non Directional
Beacon) is being questioned with the commercial success of the GPS -
Global Positioning System, and the Russian GloNAS which offers much the
same service; though the latter is not ostensibly threatened with loss of
precision to further our wartime needs (but certainly would be switched
if the circumstances warranted it, I expect.)
You will recall the sirens lured sailors onto the rocks - and in this
context, the mixed use airfield is just north of the Rock and at sea level
- familiar from the insurance company logo, which represents a view from
the north west, perhaps from Algeciras Bay.
Brian W