Recreational / Hobbyist UAS pilot reported flying their drone from a boat within a TFR area without authorization. Reporter stated they were not aware the TFR extended over water.

Narrative

I was operating my drone alongside my friend from a boat about a half mile off the coast for recreational purposes. We rented a boat with some friends to view the airshow from the water and he asked me to bring it to get some aerial shots of us on the boat. It was a disappointing day for the air show because the cloud layer and fog was so low that airplanes weren't able to fly most of the day. We noticed another drone flying off a boat next to us so we thought it would be fun to get a quick aerial picture of us while on the boat while no airplanes were flying. We had a captain in charge of driving the boat for us and asked him if it would be okay to do so and he said yes; noting that they fly drones off the boat all the time. My friend was flying it at the time and kept it well under the height of the mast and only about a 15 foot radius off the boat and at most 15 feet high above the water for a few minutes to get the shot. We then noticed a lifeguard boat coming toward us and realized that it was most likely due to the drone so I took the controls from him and landed it immediately. They asked who the owner of the drone was so I confessed it was mine and took responsibility for it then complied with their questions for personal information. They told me that drones can't be flying in the area due to the air show and I obliged; apologizing for my negligence. For some reason; maybe partly due to the poor weather; I sincerely did not think of the TFR being in affect extending over the ocean and down to the surface of the water where we were as it was my first time doing this sort of thing. While no planes were flying at the time; I still realize now that this was a violation of the airspace and take full responsibility for my actions. I am disappointed in myself for not thinking about the limitations surrounding the air show; immediately realizing I should have known better. It was a lack of judgement on my part that I will ensure never happens again by reviewing all local airspace parameters for drones especially when there's an event in the area and abiding by all safety protocol before flying.