I have 3 Helix units. A 9 G3N MDI+, and a 10 G4N MDI+ on the bow with a 112 Ultrex iPilot Link. My console unit is a 10 G3N MSI+. Obviously I have an ethernet hub too. There is no external puck other than the heading sensor for the Ultrex. The bow units use the position and heading from the Ultrex and set to heading up for the map. The console unit uses its internal GPS and map is set to course up. I have zero issues with the bow units. Everything is updated per the book. I put the units I am not using in standby…if I am fishing then the console unit is in standby. If I am running, the bow units are in standby. All power for my units, M360, mLive and hub is run straight to the battery on its own harness.
My console unit will initially display correct map orientation to the boats course but after fishing an area, its orientation will be off by 90-180 or some random amount. The boat icon is correct in relation to the map but not the actual direction of the boat. It does not fix itself. It must be shutdown and restarted then it will work properly until I stop to fish. I have tried leaving the unit on while fishing and it still looses it orientation.