This chart is an update for units preloaded with BlueChart g2 U.S. coastal maps. This update will provide customers with the newest charting additions and Notice to Mariners changes available, including navaids, port plans, depth contours, fishing contours, spot soundings and more.
•Provides basic chart navigation with 2-D or 3-D Over the Bow View map perspective.
•Includes tides, currents, marine points of interest (POIs) and IALA symbols.
•Displays port plans, fishing contours and standardized depth contours.

[Only registered and activated users can see links. ]
is a complete G2 chart
•Includes realistic navigation features showing everything from shaded depth contours and coastlines to spot soundings, navaids, port plans, wrecks, obstructions, intertidal zones, restricted areas, IALA symbols and more.
•Features smooth displays, including seamless transitions between zoom levels and more continuity across chart boundaries.
•Allows users to choose between standard 2-D direct overhead or 3-D "over the bow" map perspective to make chart reading and orientation easier.
•Provides Safety Shading (in compatible units), allowing mariners to enable contour shading for all depth contours shallower than user-defined safe depths.
•Provides Fishing Charts (in compatible units), allowing mariners to scope out bottom contours and depth soundings with less visual clutter on the display.
•Allows users to conveniently plan and organize routes, from your computer, before your trip with HomePort™, compatible trip-planning software (sold separately).

But Ballebar can be more precise than me