The GPS ski speedometer from Livorsi ranges from 0 to 50 mph, with an expanded scale from 10 to 40 mph. The expanded scale indicates each mile per hour, using GPS to determine the speed.The GPS antenna eliminates the need for pitot tubes or calibration. The gauge is offered in standard and oversized cutouts, with waterproof plug-in connectors and red LED lighting for low-light conditions. Retail prices start at $229 (gauge only). Livorsi Marine, Grayslake, Ill., (847) 752-2700. www.livorsi.com
This article originally appeared in the November 2011 issue.