An AIS AtoN is an electronic (digital) aid to navigation that is broadcast by an authorized service provider using the AIS Message 21 (Aids-to-navigation report) and may be displayed on properly configured shipborne and shore-based navigation equipment.

There are two types of AIS AtoN being used in Canada: Physical and Virtual. AIS AtoN provide a positive and all-weather means of identification to mariners. For more information, please go to CCG e-Navigation Portal.