You are better off using the Raymarine Raytech software to connect to the radar. You will still need an adapter from HSB to a PCMCIA card to a SUB cable. You can find these on eBay sometimes. If you still have energy you can try to intercept the data traffic with an app like Wireshark and eventually reverse
engineer the protocol. It is not worth it in my opinion.
You should upgrade at least to an E80 display which converts the analog data to Ethernet and the Ethernet protocol is already reverse engineered.
The Pathfinder series, while great
equipment at the time, is just too old to spend time on in 2018. It does not do
AIS overlay and that is a problem.
SV Pizzazz