Differences in Interlink and Ethernet ...

Interlink actually copies Waypoints marked on 1 unit to the interlink and the other unit ...

Ethernet allows sharing of Waypoints without actually copying to the other other unit ...

The benefit of Ethernet is that the Waypoint capacity is doubled ...because each unit can "see" and display the other Unit's Waypoint library (without the other unit's Waypoints taking up library capacity space in the "displaying" unit) ...
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Plus... Ethernet allows sharing of Sonar (in certain instances) ...

Interlink is Waypoint sharing only ...

Rin