Join Date: Mar 2006
Location: New England
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The problem you're seeing is one due to poor design. All LCD panels have polarizing filters over them, and that is in fact how an LCD panel works—the liquid crystal polarizes light, and by the degree of polarization, it changes the color of the pixel.
Unfortunately, Navman seems to have set their polarizing filters to angle perpendicular to that of most polarized sunglasses...a big mistake, and makes the instruments unreadable, and the polarized light coming off the instruments is filtered out completely by the polarized lenses.
If you want to see what I mean—take two pairs of polarized sun glasses and look through two lenses overlapped, at a relatively bright light source. Then rotate one of the lenses, and you will see the light get brighter and dimmer, and eventually be blocked completely, as the two lenses cross-polarize the light.
Another thing some manufacturers do to prevent this is to use a circular polarizer as the last layer. This is essentially a standard polarizer with an additional optical layer to change the angle of polarization, so it is not all in one direction. This is the same kind of filter that is required on an AutoFocus SLR, as many of the AF chips don't work with normal polarizers, as they have a polarized filter built into them.
I haven't had a problem with the Raymarine Gear on my boat from what I remember...
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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