Found these with the DI, then made a couple passes with SI to get a better look. My 5 year old son was with me and he thought it was the coolest! He kept looking over the side to see if he could see these "shipwrecks".
I have been messing with the settings as I am still a new user. I will check all settings and post for you. One recommendation I saw from another board member is to decrease your side beam range closer to the boat when you come across something like these wrecks - this helps to increase the sharpness on the readout.
South Korean Navy on Sunday began preparations for hoisting a warship that sank late last month in the Yellow Sea, after halting underwater rescue operations for the vessel's missing crew members at the request of their families, local media reported.