Talk:Non-directional beacon

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"With the advent of VOR systems and GPS navigation, NDBs are decreasing in use; however, they are still the most widely-used navigational aid in use today."

Justification for this? It's certainly not true in the continental U.S., where VORs are a far more dominant NAVAID. I suspect the same is true in most developed countries, but maybe enough developing countries still rely on NDBs to make the statement true?

(Also "most widely-used navigational aid in use today" is redundant...) any objections to removing the last clause entirely?

In Europe there are more NDBs than VORs, however generally NDBs are relegated to subsidiary roles e.g. secondary approach aids at airports, or even VFR-only airport locators, whereas VORs are used to define the main airway structures.BaseTurnComplete 21:39, 10 January 2006 (UTC)

The NDB system is used as a backup system to other NAVAID systems such as VOR. Years ago it was the predominant form of Direction Finding-true. in Australia, many small private general aviation (GA) aircraft use the NDB system, as VOR instrumentation can be expensive to purchase and retrofit. The other advantage of the NDB system is that the AM broadcast band (commercial ground based MF transmitters), can be used to get some idea of where an aircraft is situated in airspace. So I would agree that the statement "With the advent of VOR systems and GPS navigation, NDBs are decreasing in use; however, they are still the most widely-used navigational aid in use today." be left as is. The system in Australia is being upgraded to have newer transmitters. Fact: NDBs in Australia versus VORs = NDBs ~ 300, VORs ~ 50.--Read-write-services 01:16, 15 January 2007 (UTC)

[edit] NDB in the AM Broadcast band.

An edit to this article changed the AM MF band from 535-1600 kHz to 500-1700 kHz. The traditional band coverage is 535-1610 kHz with 9 kHz spacing. Now in the US, and in other places (Europe and Asia as well-I think), the range is 500 to 1610 kHz with 10 kHz spacing. (with 1610 - 1710 kHz as the 'Extended' AM MF band). When "Correcting" an edit, one should check by proper investigation and verification. My source is the Australian Communications Authority - Spectrum Chart rev. 2002.

--Read-write-services 01:32, 15 January 2007 (UTC)

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Talk:Non-directional beacon

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[edit] NDB in the AM Broadcast band.

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