When flying low in commercial planes (mostly just before landing) I have been surprised by how visible blue objects are - tarps on roofs, pools, ...
That has led me to wonder if bright blue would be a better color for detection - especially during the fall when many trees in the midwest lean toward the red and orange colors.
Light blue might be good. Very dark shades of blue (ie. navy blue) are too dark and blend way to easily with dark vegetation, in my experience.
I vaguely recall hearing a USCG guy once, who said that in ocean searches, really light blue ("robin's egg blue") tended to stand out really well. I can't say, as I've not much experience in over water searches.
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