I know of two: Daubigny and Monet.
A couple of years ago I attended the Peabody Essex Museum's, Impressionists on the Water, exhibit where I delighted in viewing, "The Boat Trip" by Charles-Francois Daubigny in 1861. It's a collection of 16 small etchings made into a book telling of his painting adventures aboard his Le Botin...it is quite humorous.
Claude Monet began his adventures aboard his floating studio on the Seine soon after seeing Daubigny prints on display in Paris. The painting below sure looks peaceful.and 'far from the maddening' crowds of on lookers.
Now that I am summering at my cottage near Long Sought for Pond, I scrubbed down my 8 foot sailing dinghy in anticipation of my first painting session on the water. I practiced my boat set up on dry land the night before. Simplicity was key because "Don't Rock the Boat!" was my mantra.
Leaving the tripod head and post attached to my Stratus pochade box, I 'stepped' it into the hole where the mast is usually positioned at the bow and secured it with a bungee cord. Within a tightly covered, plastic legal file box, I placed all my painting items. One of my concerns was turpentine spillage in my boat and possibly into the water. So I brought along a Masterson covered palette tray. I placed it on top of the plastic file box (positioned between my legs) with the open can of turp, paints and brushes on it as I painted.
Next I gathered my oars and PFD for tomorrow's rendezvous.
Five o'clock in the morning. It was cold and calm...just the way I liked it. I cast off, rowed through sea smoke rising up from the warm pond. Mayflies and their dancing partners reflected in the mirrored surface dipped and bobbed, a bullfrog bellowed somewhere near the shore line.