Raymarine - i50 Depth Display System with Thru-Hull Transducer - E70148. The all-new i50 Instruments from Raymarine offer boaters an excellent combination of great looks, high performance and extreme value. Designed to accommodate either stand-alone or fully integrated installations, the i50 instruments feature Raymarine's exclusive SeaTalkng networking for simple installation and bullet-proof reliability. Each instrument offers extra-large digits, razor-sharp LCD displays and red backlighting f