During the summer I night sail a lot to beat this Texas heat. Yes it's legal to night sail without a masthead/anchor/all around 360 deg. while under sail in a h23, but Texas law says every boat shall display a 360 deg. light while underway at night. Power or sail. I have been stopped at night 3 times and have not been cited as USCG law/rules supersede Texas law/rules. This always took 30 minutes and showing my copy of USCG law to them and having them board my boat and look for further infractions. I did add an anchor light and burn it underway now just to stop the hassle from Texas lake law enforcement. I have not been stopped/boarded since. I added the anchor light 3 years ago.