Join Date: Dec 2006
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For opening ports we have oversized covers roughly shaped to the size of the opening port, with shock cord or elastic sewn in around the edge. This allows us to snap them over the opening port and the elastic holds them in place. They are lined so they completely block light. We also have lined blackout covers for the translucent hatches, and lined blackout curtains for the main (non-opening) cabin ports.
We use these if we want to sleep in when pretty far north in summer, where morning comes very early, or after a tiring passage, when we'd like some extra sleep, but usually it's when we have teenagers aboard, who'd like to sleep in.