Why are Notices to Mariners issued?

A Notice to Mariner is issued for the purpose of providing permanent navigation information, and generally, this information will result in a chart correction.

A notice may be marked as Temporary (T) if the information will remain valid only for a limited time.

Advice notices will cover short-term navigation advice and may include information on fireworks displays, aquatic events or similar.

If at any time you see something on the water that you think may pose a hazard to navigation, please contact MAST so that a determination can be made as to whether a Notice to Mariners needs to be issued.

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