So just a bit of heads up for those that network a HDS gen 3 (as i do ) with older HDS units such as Gen 2 T or Gen 2 or even Gen 1 - maybe be aware that the latest update 18.2 - 60 . 1 . 142 for the hds gen 3 from Lowrance now allegedly jeopardises gen 3 ability to ethernet network with the previous legacy hds units as it is for networking with the later newer hds carbons or live units - so best to stick with the previous upgrade 7.0 -59.1.86 for ethernet networking with the older hds units (which can be rolled back to if need be - which i had to do ) - good ole navico have allegedly abandoned the previous sensible approach of updates being able to be suitable to ethernet network all hds units regardless of generation or age etc - so maybe just a quicker way to obsolete the older units i guess so we all have to buy the newer models

have a read of this article http://teamcolibri.blogspot.com/2016...hds-gen-3.html and if interested particularly the final EDIT 30.11.2018: at the end

cheers