How does elevation affect boat performance?

In general, elevation (anything above sea level) will have an adverse effect on a boat's performance, as the 'thin' air of higher altitudes contains less oxygen. Just as humans find it increasingly difficult to breathe as they climb in altitude, so do engines - less oxygen available for combustion results in less horsepower, which means reduced performance. Above certain elevations (2,500 feet and above), propeller - and sometimes transmission gear ratio - changes (relative to sea level selections) are necessary to allow propulsion systems to operate within the manufacturer's specified rpm range.

updated: 4/1/2008