Raybend, call Garmin, fight the call tree until you get to the technicians. They are very cooperative and from my experience will answer straight up. The GHB 20 has the brain attached to the new brushless motor-pump. The $4k tariff is a killer.
I called and ask if a Com-Nav autopilot would marry to a Garmin Plotter. They said yes, the competitor will work just fine.
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