BlueChart g3 Vision HD – VUS020R – St. Lawrence Seaway – microSD /SD Coverage:Covers the St. Lawrence River from Brockville, Ont. to Sept-Iles, Que., including Montreal and Quebec. Also includes detailed coverage of Lake Champlain and Lac Saint-Jean, including Burlington, VT, Rideau River, the Ottawa River to Temiscaming, the Riviere Saguenay from Chicoutimi, Que. to the St. Lawrence River, and the Hudson River to Troy, NY.Premier Coastal Navigation ChartsProvides industry-leading coverage, clarity and detail with updated coastal charts that feature integrated Garmin and Navionics dataAuto Guidance technology uses your desired depth and overhead clearance to calculate routes and show a suggested path to followHigh-resolution relief shading combines color and shadow to give you an easy-to-interpret, clearer view of bottom structure than contour lines aloneDepth Range Shading provides up to 10 depth ranges, enabling you to view your target depth at a glanceUp to 1′ contours provide a more accurate depiction of the bottom structure for improved fishing charts and navigation in swamps, canals and marinasExperience unparalleled coverage and brilliant detail on the water. BlueChart g3 Vision coastal charts provide industry-leading coverage, clarity and detail with integrated Garmin and Navionics data, Auto Guidance technology and high-resolution relief shading. Auto Guidance TechnologyThe Auto Guidance feature uses your desired depth and overhead clearance to calculate a route and a suggested path to follow.High-resolution Relief Shading FeatureHigh-resolution relief shading combines color and shadow to give you an easy-to-interpret, clearer view of bottom structure than contour lines alone.Up to 1′ ContoursThe closer the contour lines, the more accurate the depiction of the bottom structure for improved fishing charts and navigation in swamps, canals and marinas.NOAA Raster CartographyIf you prefer your display to have the look of paper charts, NOAA raster cartography2 is available as a free downloadable feature via the ActiveCaptain app.Depth Range ShadingThis feature provides up to 10 depth ranges, enabling