In order to view the SonarChart™ on a GPS plotter, it is necessary to select that layer. It is also necessary to download the SonarChart™ data onto your card prior to accessing it on the plotter. (See Downloading charts to your Navionics+ or Navionics+ Updates card.) Selecting that information in a menu in the plotter will vary with the specific plotter model. Typically a menu selection such as "SonarChart" or "Fish N Chip" is selected. Consult the plotter user's guide for the procedure specific to your GPS plotter model.