The Blue 100 was designed for the offshore fishing enthusiasts, with increased power and dual operating frequencies of 50/200kHz. Features Garmin's exclusive Depth Control Gain (DCG), which adjusts sounder sensitivity by depth, resulting in a more detailed picture of bottom structure. The 100 also has Garmin's exclusive - See-Thru technology, which separates fish from thermoclines and structure, giving you a clear picture of what's beneath your boat. The Fishfinder 100 has 300 watts (RMS) of dual frequency operation (50/200kHz), with a max depth range of 1200'. The display is a FSTN, four level gray scale with 100 x 160 pixels. Screen dimensions; 2.1''W x 3.3''H.