I am looking at hummingbird for the first time . I can honestly say i have never been sea sick but sorting through whats on the market now is making me feel a little green. I really need some input on sidescan on the small screen. At this moment im leaning to the 778 i have a older garmin 180gps and if anyone can give advice on why i need gps in my finder i am all ears.In fact i am open to and will listen to any thoughts on any of the 500 and 700 series options and there actual values on the lake. so if anyone wanders in off the lake ... please share some thought