C-Map 4D Chart NA-D931: Lake Michigan (Update) Irish Sea and St. George's Channel 1 Preparation and Precautions

1 Preparation and Precautions

This midsize instrument is designed to indicate optimum climate conditions when both hands cross in a limited area of the dial called the COMFORT Zone

3 Loss of Position

NOAA Traditional Chart (Not for Navigation)

C-Map 4D Chart NA-D931: Lake Michigan (Update) Irish Sea and St. George's Channel 1 Preparation and PrecautionsWhy Update Your C Map Chart? Why Update Your C Map Chart? It is very important that the latest C Map charts are used when sailing out in the open water for safe navigation purposes. The C Map electronic chart libraries get updated twice a year to coincide with popular boating sessions. Included in the library updates are the latest notice to mariner updates from government hydrographic offices, updates to marina facilities, port services, photos and