Am using Qgis,
Open cpn and
Google earth!
Qgis has good stability wich is lacking in
open cpn. Next
Google earth shows waters depths, that mouse pointer information can bi used to build
charts. Am interested in setting up open cpn to show GEBCO geo tiff bathymetry image as base chart in open cpn, if developers can make that feature a live in open cpn, so users can download GEBCO image file and enable it in open cpn. Wish open cpn had more stability when working with portable external hard drive, main is Toshiba hdd.