 As a pilot boat is required to be on station during all weather and, in the case of the San Francisco Bar Pilots of the time, remain on station for about five days supporting a crew of seven hosting up to ten pilots, modification was required.The Association had the vessel modified by The Moore Dry Dock Company of Oakland, after consultation with the original designer, increased power with a Atlas-Imperial diesel engine to replace the original Atlas diesel engine that in turn required modifications to the stern to accommodate a larger shaft and diameter propeller with pitch replacing the original diameter, 2-bladed propeller.The propulsion change increased speed from approximately knots.