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Polarized Sun Glasses: Was Off Topic: GPS for Cars

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pbarker(at)hughes.net
Guest

Posted: Wed Feb 07, 2007 2:22 pm Post subject: Polarized Sun Glasses: Was Off Topic: GPS for Cars

I don't know about problems regarding the canopy, but I have had 

difficulty reading some digital readouts. I checked out in a rental 

Cessna at the local FBO and found that the nav/com had the plate over 

the active frequency polarized one direction and the standby the other. 

Through my polarized glasses it looked like the LED display for the 

active channel was dead, but as soon as I raised my glasses and looked 

again they were lit up fine. The CFI got a little miffed that every 

time I needed to change frequencies there was a delay as I pulled my 

sun glasses off. He didn't understand the problem, as both displays 

looked fine to him and his non-polarized glasses. 



 	  Quote: 	
		  Time: 09:15:38 AM PST US

From: "Terry Watson" <terry(at)tcwatson.com>

Subject: RE: Off Topic:  GPS for Cars

Somewhere over the years I was convinced by someone that polarized 

glasses
	


 	  Quote: 	
		  were not to be used in the cockpit. The theory was that under certain

orientations the canopy and the polarization of the glasses could 

block all
	


 	  Quote: 	
		  or too much light and therefore vision. 



Was that all wrong?

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arno7452(at)bellsouth.net
Guest

Posted: Wed Feb 07, 2007 5:17 pm Post subject: Polarized Sun Glasses: Was Off Topic: GPS for Cars

For what it's worth,



I am told aviator's glasses are not polarized for the purpose of picking up 

glare from other aircraft.  The polarization often blocks the glare bouncing 

off from the plane and consequentially you may not pick up in your visual 

scanning.  I found that in the pattern, I often have trouble locating other 

planes in the pattern and I wear aviator glasses.



Ken Arnold



do not archive



---

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Tim Olson

Joined: 25 Jan 2007
Posts: 2879

Posted: Wed Feb 07, 2007 5:36 pm Post subject: Polarized Sun Glasses: Was Off Topic: GPS for Cars

Fly with any of today's glass cockpit EFIS's and graphical

color GPS screens and you'll quickly see why you don't want

polarized glasses.  Even the GTX330 transponder can be unreadable

when tipping your head at certain angles.  There are multiple items

in my plane that you can get to go black as you tip your head.

With non-polarized glasses, it's no problem.  On the upside,

everything in the plane is very readable in sunlight and

a bright cockpit.



Tim Olson - RV-10 N104CD - Flying

do not archive

Ken Arnold wrote:

[quote] 

 

 For what it's worth,

 

 I am told aviator's glasses are not polarized for the purpose of picking 

 up glare from other aircraft.  The polarization often blocks the glare 

 bouncing off from the plane and consequentially you may not pick up in 

 your visual scanning.  I found that in the pattern, I often have trouble 

 locating other planes in the pattern and I wear aviator glasses.

 

 Ken Arnold

 

 do not archive

 

 

 

 

 

 ---

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walter(at)tondu.com
Guest

Posted: Wed Feb 07, 2007 6:14 pm Post subject: Polarized Sun Glasses: Was Off Topic: GPS for Cars

On 02/07  7:36, Tim Olson wrote:



 > Fly with any of today's glass cockpit EFIS's and graphical

 > color GPS screens and you'll quickly see why you don't want

 > polarized glasses.



Don't know about other EFIS systems but I routinely fly behind

my GRT EFIS with polarized sun glasses and see the screeen

very well.  ymmv.



-- 

Walter Tondu

http://www.rv7-a.com - Flying!

http://www.evorocket.com - Building

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