Mike, you have summed up PUP most succinctly! John - aboard "Truelove" in Trinidad, W.I. "Seahorse" - on the hard in St. Augustine, FL Reply to: John@Camm.us Mike Maurice wrote: Vessels without tall masts are more susceptible of rolling due to the lack of roll moment inertia. Motorboats generally have this characteristic. This means Passagemaking Under Power.