Can't see anything about these in the Manual, so thought I'd ask.
It should be obvious what they do - Guard has a ship watch over a particular hex or area, and Sentry should patrol an area and attempt to intercept enemy ships passing close by.
Yet I have yet to actually see them do anything. I only use them at present as commands in order not to be asked every darned turn whether I want to move my idle ships...
Are they good for anything?
Thanks and cheers, Ed