On-Board navigation data handling
This page contains a illustration of the sources and handling of Qastor navigation data.
This diagram is based on an original by @a user

Dia source file here:
 - PPUs ( Portable Pilot Units): 
MPU (Main Positioning Unit), Position, Heading, 

 - Pilot Plug socket:

 - Pilot plug cable:

AIS (Automatic Identification System) transponder rules: AIS transponders
ECDIS (Electronic Chart Display and Information System): What is Electronic Chart Display and Information System (ECDIS)?
How a bridge looks in reality:
