Mark
Double negatives aside ............ how do you rate the double positive of a
warning that DOES occur when you have no idea that the other ship is aiming
for you HEAD-ON.
No technology is going to be perfect and not all ships will ever be fitted
with a suitable unit ... but how many good warnings does a pilot need to
justify spending $500 - $1000 on a safety issue.
I'll take that double positive any day ... and if there were others in OZ
with the unit fitted, I'd spend the money tomorrow.
If there are going to be a few Flarm equipped European ships in the
Temora/Corowa/ Tocumwal/Narromine area this summer, I'd even put one in.
Geoff
----- Original Message -----
From: "Mark Newton" <[EMAIL PROTECTED]>
To: "Discussion of issues relating to Soaring in Australia."
<[email protected]>
Sent: Tuesday, July 05, 2005 11:14 AM
Subject: Re: [Aus-soaring] FLARM
On 05/07/2005, at 10:35 AM, Geoff Kidd wrote:
Mark
I can only go on what the Europeans have said .... but it looks like
they get a warning on the Flarm and actually find another Glider where
the Flarm indicates it would be. That's a pretty good test I reckon.
What happens when they don't get a warning on the FLARM even though there
is another FLARM-equipped glider very close by which they haven't seen?
(which is what Don Ingram was getting at wrt the reliability of the
communications channel)
You can beacon your position and height as often as you want and it
won't make a lick of difference to your survival rate if the
communications
channel you're transmitting on is compromised, and nobody else can hear
you.
You said the Europeans say they get a reliable indication. I put it
to you that it's absolutely impossible to determine whether the
indication is reliable without being able to quantify the false
negatives.
And false negatives are precisely the class of FLARM failure which will
totally fail to be revealed in anecdotal evidence.
- mark
--------------------------------------------------------------------
I tried an internal modem, [EMAIL PROTECTED]
but it hurt when I walked. Mark Newton
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