I run 2 of these on my boat, and that being said they arent the best out.....BUT...I love mine!!!! they are easy to use, I can get them to show arches (fish) and structure....and I'm not sure how I ever fished w/out GPS....have had one unit for multiple seasons & just picked the 2nd one up this year.....there are better out for more $$$$...but these are pretty good units, I will use mine until I can afford SI...

I'm 99% sure you cant link em, but you can share your waypoints via and sd card bery easily

yes they are made by lowrance, kinda the entry level lowrance

have a great one, God bless