I agree… but I had 2 plotters and my GPS puck failed so I had my back up GPS from my AIS transponder on the network take over.
A new puck was ££££ so I got a 2nd hand Simrad unit to add to my network for less money than a new NEMA2K puck… that had an inbuilt GPS…. I fixed the old puck but only after I had fitted my 2nd hand MFD…. So now it looks like star ship enterprise 🤣🤣 but I’ve got 3 MFDs, 3 GPS inputs hence my comments about relying on electronics.
However, even with Radar and an AIS transponder and a full radar reflector I don’t head out in fog… If fog comes done I can get home.
Obvioouaky electronics can fail, just as my spaniel can eat a paper chart… so it’s all about risk management..