Sonar imagery reveals bottom hardness in contrasting color on select U.S. OVERLAYS: SonarChart™ Shading and relief shading overlays allow you to have a better understanding of bottom topography for improved fishing and diving. GOVERNMENT CHARTS (NOAA): These are available within the following coverages: U.S. SONARCHART™ HD BATHYMETRY MAPS: Extraordinary 1’ (0.5 meter) HD bottom contour detail is the ideal tool for locating new fishing areas. NAUTICAL CHART: Use this premier marine reference to study port plans, anchorages and safety depth contours, locate navaids, marine services and more.
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