I have a 73SV Plus on the front and a 73SV UHD on the back. Garmin tech told me i could run their ethernet between the two and share data. I’ve messed with a few things over the last week to no avail, resetting to default communications settings every time. To make it even more odd, I can mark one on the front, say wpt 154. it will not show on the rear, but if i mark on the rear it will mark as wpt 155. and so on. both graphs also work with my activecaptain data sharing separately just fine. any ideas?