Switch between the same three views used in the app: Traditional for the Florida Keys Salinity Chart, Satellite for Mapbox aerial imagery, and Relief for Salinity’s orange BlueTopo bottom shading. The center and zoom stay put when you switch. Hold for half a second to place each point, undo the latest mark, edit coordinates, check nearby NOAA context, and export GPX.
THREE APP-MATCHED CHARTS
Build the trip point by point.
Loading the Salinity Chart pack…
Drag to move · Scroll or pinch to zoom · Hold ½ second to place
Salinity Chart · NOAA BlueTopo-derived Keys v4 · reference only