Charles T. Low wrote:
I knew I remembered some problem with the old red-light advice, and found
this reference: www.aoa.org/clincare/aviation-night.asp The problems wasn't
what I thought it was, but the site contains a large amount of fascinating
information about night vision.

One of the problems it mentions regarding red light is that you might not be
able to see red things on your chart. Are any important things on charts
colored red? Red light is also harder to focus on in dim conditions, esp. as
we grow middle-aged and our "arms shorten."

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Charles T. Low
www.boatdocking.com

There are any number of things in "magenta", which are affected by red
lights.