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terrain alert thresholds


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pink leader
pink leader
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Trying to undertsand how this works.

The default is 800' vert and 3.0NM horizontal.

I guess this means that if current track and altitude takes you to a point where vert clearance is <800', then at the 3 NM point you will get a warning on screen.

Or it could mean that if you are going to pass within 3 miles of a clearance <800', then you will be warned.

Also how does this work in the circuit and on landing? I have noticed being plagued with ATZ warnings in the circuit and have switched the machine off. But I dont remember terrain warnings  .. maybe these were switched off anyway.

What settings have others used to get the best balance?

David

PS Similar principles apply to obstructions I assume.

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gaxor
gaxor
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pink leader (10/08/2010)
OK. Lets take the example of flying from Oban to Inverness up the Great Glen as I did earlier this year. Cloudbase was pretty low and so whole way up I wd have got non-stop terrain warnings .. and the stress level of low cloud was high without continuous warnings. Amending the horizontal limit in flight wd be impossible (even if keyboard worked in WinCE). I suppose I might have been able to untick it .. doubtful.



Suggest either absolute terrain clearance via the map .. but destroys the simplicity of your maps, or another terrain page entirely (a la garmin) or a simple way to turn off terrain warnings quickly & easily in flight



D




Would the new format of version 1.4 allow you to easily toggle terrain warnings via the touchscreen?



Gary
GO

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