I'm with pappy...on the red spots. BTW if you will turn your hand over and touch the screen with your fingernail when you point out something on the screen, you will not fingerprint your screen up. Saves on cleaning. Those HDS screens are not easy to clean and don't use anything with a solvent in it to clean them. Sometimes it's easier to see fish with sonar as arches. I always use both downscan and sonar at the same time. That's why I have both a HDS5 and HDS8 together on my console. Together they were cheaper than an HDS10 and have about the same sq. inches of screen total. I have map and sonar on the 5 and dedicate full screen 8 to downscan or sidescan. Oh...have you gotten the latest software for you HDS unit. It has new features and doubles the refresh rate on your maps which makes crossing waypoints dead-on easier than before.