what the?

[BUMFISH]

Looking in my ERSA I came across
'ABN ALT WG 8 Sec'

what does this mean?

also, what is the reference point of an aerodrome....?

[AffirmBrest]

Erm... Airfield BeacoN ALTernating (flashing) White & Green every 8 Seconds?

Aerodrome Ref Point is the position used for elevation measurements and Lat Long etc. - I believe it is worked out using a mean position between the centres of the longest runways or something. You shouldn't worry about it too much unless you have INS or GPS to navigate - then you need to be aware of the implications.

I think...
AB

PS What's an ERSA? (En-route Supplement something or what? UK or US?)
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...proceeding below Decision Height with CAUTION...

[This message has been edited by AffirmBrest (edited 22 March 2001).]

[BUMFISH]

Thanks for that

ERSA - En Route Supplement Australia

Cheers...