Using the GPX utility and the Chart Work family of programs is it possible to do on an electronic nautical chart the work you do in a traditional way.
The three programs are:
Coastal navigation LoP
Chart Work - Traditional paper chart work on an ECS.
the three types of lines of position used are:
Fix by three simultaneous bearings.
Fix by three simultaneous bearings. Detail.
Offshore navigators use celestial navigation,sextant observations, as a backup for the GPS. Use a sextant for taking the altitude of a celestial body and OpenCPN to plot the celestial circle of position instead the LoP -Line of Position-. Repeat this and take at least three sights. You easily can check if any danger is near your fix, and the uncertainty in your position.
Parameters of a circle of position in astronavigation.
Composite Route plot with OpenCPN.
RDF or radiogoniometer provide a bearing. Its line of position may be plot using GPX input. Two options:
Fix by two RDF bearings with OpenCPN.
Using the OpenCPN GPX utility and the Chart Work - Piloting program is it possible to do on an electronic nautical chart the work you do in a traditional way.
Piloting and coastal fix