How long is the electronic chart current for boats?

• A. 1 month
• B. 3 months
• C. 6 months
• D. 12 months

Answer: (C)

Electronic charts must be kept current because navigation data changes—new hazards, updated depths, and revised aids to navigation can appear after charts are issued. In typical training and practice, an electronic chart is considered current for six months, so you should install the latest updates at least every six months and check for any Notices to Mariners that could affect your route. If you operate in areas with rapid changes, update even sooner and verify the chart’s date stamp or last update. Relying on data older than six months increases the risk of missing important changes.