Ive used Lowrance units for years and love them, I believe the latest units have electronic compasses built in which is a great feature for pinpointing and always having the screen showing the direction you are facing (even while reversing). If searching for sunken boats or finding good snorkel and diving reef down and side scan are extremely usefull, in shallow water you can locate even small objects such as a bottle (if you ever need to search for a bottle!!).
Heres a couple of images from my hds 8.
side scan with a humpback.
down scan + standard 200htz