Never worked from a boat but from eighteen months ago have had at least one day a week "working from home". Employer was fully supportive; office mobile phone and an office laptop with both 3G (Vodafone) and WiFi built in.
Biggest problem for family, friends, neighbours and yourself is to get the message that you are working at home, not working at home.
I have a friend who runs an overseas travel company. He puts a suit on to go to work... under the stairs. His argument (which I can't fault) is that if he stops for a coffee, in his pyjamas, he will feed the birds, do the crossword, empty the dishwasher, anything but go back to work. If he stops for a coffee in his suit he carries the (hot, full) mug back to his office.
Personally, I think I work harder at home for less stress. I get up at the same time as when commuting, work 06:15 to 07:15 then stop for an hour for breakfast with Mrs 1st Ade. By 08:30, some replies are already coming to earlier emails and it goes on from there. I tend to pack up earlier than when I'm in London but leave the laptop on, glance at it every now and then and reply to any urgent queries until about 18:30. To my mind (and my boss's) that better than "it's five O'clock - I'm out of here"