Had spent perhaps one day going through lockers and identifying what was there in what’s on my boat. Day before boat was to leave Miami for Georgetown, Bahamas, shipyard called me in a full frenzy, telling me that the March pump running seawater to all three A/C units had gone out, and that they were looking all over Miami for one so that the boat could leave on time.  That when they found found a pump in Miami, they would send one of their workmen to drive to whoever had it, drive back, and they would stay late to install. Of course, all of this would happen at $100 to $125 an hour, including calling to find the pump, driving in traffic to get it, then a team staying to remove the old one, install the new one, test, etc.  I fissured 10 to 15 man hours, plus full retail for the pump plus yard markup on the pump retail cost of 35%.  With “Whats On My Boat” I was able to say, “Hold on,” look up the pump on my iPad, and tell him, walk forward on the boat, raise the mattress in the forward stateroom, raise the cover over the middle under berth locker, and you will find a box marked AC Pump.  It will have the model number 150-0026-100, use that one and I will bring a new spare with me when I meet you in Georgetown. I saved $1000 to $1500 easy by being able to instantly tell them where the part was, what the model number was, and reorder myself on line at a discount.