The Humminbird 959ci HD DI is built around an HD TFT display, which has a diagonal measurement of 8 inches. The quality of the screen—as well as the greater-than-normal width-to-height aspect ratio (16:9)—allows you to boost your on-the-water performance due to enhanced whole screen or split screen viewing.
The fully waterproof Humminbird 999ci HD SI Combo sonar fish finder has a wide variety of features for finding fish in multiple locations. The screen is eight inches wide, and consists of a 480V x 800H pixel high definition full-color LED display that is in a 16:9 ratio. Side Imaging Sonar and Down Imaging Sonar allow for clear images of structure and fish
GPSMAP 840xs is a part of the new series of fishfinders from Garmin that support down imaging as well as side imaging (Garmin branded those technologies as DownVü and SideVü). Down imaging is built-in while side imaging requires a GCV 10 module that is sold separately.