North Atlantic Tracks & Gross Navigational Errors
would anybody have any links that explain Gross Navigational Errors on NATs? Is there a CAA or FAA reference that I could use to determine the process for how they are monitored or reviewed?
I've found some material via google on events which led to a GNE but I'm looking for the laws or what ATC guys are taught.. Many thanks zoink.. |
A GNE is defined as one of the following (at least in Shanwick airspace):
An observation which differs from a report by 25nm or more laterally, An observation which differs from an estimate passed by Shawick by 25nm or more laterally or A report which differs from an estimate by 25nm or more laterally. Responsibility for monitoring GNEs in NAT airspace is delegated to the North Atlantic Central Monitoring Agency (NAT CMA), you can read a bit about them here: CMA Hope that helps. |
this is perfect. thank you G-OFUK!!
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In addition to the above, Shanwick procedures and the NATCMA requires any occasion where ATC takes action to prevent a GNE to be logged. Such "Interventions to Prevent GNEs" are far more frequent than actual GNEs and crews often don't realise that the very act of stating an intention to route to a position not specified in the Oceanic Clearance will result in reporting action being taken.
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rab-k
Oceanic airspace is patently more anally retentive nowadays than it was when I worked it if every error has reporting action taken on it. H/F comms are diabolical, the pilot reports his current position, his estimate for the next position and then the subsequent position after that, the last one probably being the 'error'. Even if the pilot gives his next position as incorrect who is to say the pilot did that? Because H/F is so crap, perhaps Ballygirreen misheard it therefore it is not the pilots fault. Aircraft GPS systems are highly accurate, yearly, how many real GNE's occur, bearing in mind the volume of modern aircraft that fly trans-Atlantic? probably one or two. |
WhatMeanPullUp
You "worked" Oceanic? Then surely you would know that...
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No, not acceptable but I am not anal enough to go into the depths that you have done to reply to a basic response.
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