Here is a list of some web sites I have found useful with this project_
github : Yacht-computer Files for the project
Cruisersforum.com OpenCPN etc.
ESP-WROOM-32 Documentation
ESP32-board-wifi-lora-32 ESP board with screen
The Internet of Things with ESP32 - SSA
SignalK Specification vesselsBranch
demo.signalk.org/@signalk/playground/dist/
github SigkSens/blob/master/USAGE.md
Signalk.org/specification/1.0.4/doc/data_model.html