Built into the Helix and Solix series multifunction displays, Mega Imaging uses a 1.2 MHz frequency sonar — the highest frequency of any recreational fish finder. The greater number of sonar pulses over a given period of time results in superb target separation and clarity. You can select from Mega Side Imaging (MSI) and Mega Down Imaging (MDI) modes. MSI looks side to side; MDI looks vertically. The photolike returns are a cinch to interpret. Shipwrecks look like ships, underwater trees look like trees, and submerged bridges look like bridges. Many times, fish look just like fish.