I am going to purchase a basic GPS/bottom machine combo for a boat I am setting up. Being an old fart my tech skills are pretty much non-existent. Does anyone have any suggestions for a fairly simple intuitive system? I will be putting it on a 17 ft Boston Whaler and will use the boat for crabbing, fishing SRC and resident salmon and as a pleasure craft for the grandkids. Thanks for any insights you may offer.