AIS Aids to Navigation (AtoN)
AIS used as or on an aid to navigation (AtoN) uses this basic format 9192M3I4D5X6X7X8X9, where the digits 3, 4 and 5 represent the MID and X is any figure from 0 to 9. See Types of AIS and AIS Frequently Asked Questions #21 for instructions on applying for a Private AIS Aids to Navigation station.
AIS AtoN Use in the United States
| Alaska | 993030000 - 993039999 | |
| General (non-USCG) | 993660000 - 993669999 | |
| US Army Corps of Engineers | 993660000 - 993662999 | |
| Private (non-federal) | 993663000 – 993666999 | |
| Federal | 993667000 – 993667999 | |
| AIS Mobile AtoN | 993668000 – 993668999 | |
| US Coast Guard | 993670000 – 993699999 |