Slowly, I am replacing older ST60 instruments, with new technology from Raymarine throughout the yacht. Keeping the speed, depth and Wind for the time, but the Autopilot, GPS and MFD are updated with STNG cables. So that I do not cripple myself, how can I test a SeaTalk cable to determine if it has any power, and/or transmission data live on the line? (Trying to effectively discard the old system wiring for the new STNG cableing...) Thanks.
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