Talk:Air navigation

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The United States has GPS approaches. I believe GPS is perfectly legal for use as a primary means of navigation and one can file a flight plan with the route as 'GPS direct'. Perhaps I'm misunderstanding what the author meant at the end of the page.

I wrote it. It sounds like the situation has changed since 2000 in that case, or maybe the US allowed GPS prior to that time. It's still not approved in the UK for primary navigation AFAIK. Someone with the definitive facts should amend the article, unfortunately it seems my own knowledge is out of date. GRAHAMUK 08:11, 13 Nov 2003 (UTC)

I don't know the status of the UK, but I know GPS is legal as primary navigation (for most things) in the US and has been for about five years. I'm told that 'most' countries have followed suit. Selective Availability is now a thing of the past and RAIM makes GPS much more reliable. WAAS will make it even more so. You cannot, for example, substitute the GPS location for a VOR for that VOR in an approach (if that was allowed, the FAA would publish a GPS approach), but you can substitute an en route intersection so long as you retrieved the intersection from the GPS's database and that database is current. (You can't enter the fix yourself. The FAA considers the chance that you'd make a mistake to be too great.)

[edit] GA??

GA = General Aviation?? —The preceding unsigned comment was added by 6.3.55.1 (talk) 23:20, 7 December 2006 (UTC).

Absolutely! - Mugs 18:55, 13 January 2007 (UTC)