This is what the class rules state:
12. The following devices and electronic instruments are permitted while racing:
• Mechanical masthead wind direction sensing devices such as the Windex®.
• Devices to measure speed, distance and water depth.
Rules of the Ultimate 20 Class Association December 19, 2020 Page 10
• All types of compasses, including the Tacktick® and other electronic compasses.
• VHF radios.
• GPS based devices may be used only to measure speed and indicate heading, and marking (pinging)
the starting line during One Design class racing. Fully functioning GPS based devices may be used for all
other types of racing
