and keeping in mind that I have a 997 already. What would be the best humminbird for the bow of my boat. One where I could interlink them to get way points from the 997 to the front. I have a Lowrance 520C with a GPS puck already but you can't interlink them so I guess I'll sell the 520C along with a Garmin 120 and some other Humminbird I have that came with the bay boat to get the cash to pay for all the items I need