Originally Posted by sailingdog
I guess you could put up two anchoring daymarks and sleep for a few hours during the day. The signal of two round dayshapes over one another indicates that the boat is not under command IIRC. I think that if you're single handing, being awake at night is more important than being awake during the day... but it also depends on where you are at the time. Sleeping in the middle of a large shipping channel to a major harbor is asking to win a Darwin Award.
Staying out of the shipping channels as much as possible is a good idea for small sailboats that are single handing.
SailingDog you have it correct: Not Under Command
is; Two vertical black balls during the day and Two vertical all around red lights at night. But that don't relieve you of having to maintain a proper lookout. But it may by using those day shapes or light, keep you out of a little less trouble.
And a little less trouble may make the difference. But then you are depending on someone who may or may not be standing a proper lookout on one of those ships. And as to whether they see the Not Under Command
shapes or lights may be another story.
A single hander was partially held at fault by the courts when he was ran down by a ship, because he was not standing a proper lookout. The only good part of his story was that he survived the collision.
But maybe someone can program a RaCon or a Sark to display a singlehander's code on a ship's radar and have it accept by SOLAS. Anything to make life safer out there.