Size is not relevant. Try taking some meds.
. It is great having a 10,000$ unit that can do everything, but sometimes keeping it simple on a kayak is best. Your issue is more than likely sea sickness. Go with Elite 7. HDS live is better, but has too many unnecessary features for a kayak. Deals are great right now for a good reason. A new product is probably gonna be introduced in summer. If your itching to burn some money, then grab HDS. I have like new transducer if you need one. Grabbing head unit is dirt cheap right now. 3 in 1 transducer. Probably with warranty.