All Offshore G-charts are digitized directly from existing government and other official charts.

Digital charts are intended to be used as an aid to traditional navigational charts, not as a replacement.

A prudent navigator never relies on any single source of navigational information.

GARMIN programs electronic Offshore G-charts using Navionics digital cartography. In the production of digital cartography, Navionics uses the latest editions of paper charts available corrected to the NTM (Notice to Mariners). Digital cartography production may take 1-12 months for a single cartridge, depending on source data. Therefore, some cartridges may not report current NTM on the month of release.

The paper chart corrected to the latest NTM is the official legal document required by the Coast Guard. While electronic charts are an excellent aid to navigation and provide an extra measure of safety by showing graphically where a vessel is on a chart, you must still navigate by the official paper charts corrected to the latest NTM according to the Coast Guard.