Sailing Glossary - Term Accuracy rating

A number of quantity defining a limit that errors will not exceed when a device is used under specified operating conditions. Accuracy rating can be expressed in a number of forms, i.e. in terms of the measured variable (± 1°C), percent of span (± 0.5% of span), percent of upper range value (± 0.5% of upper range value F.S.), percent of scale length (± 0.5% of scale length), or percent of actual output reading (± 1% of actual output reading).