Raymarine TackTick series Bidata wireless system. The system contains:-T111 Multifunction wireless display shows two lines of data simultaneously. -T121 Inboard transmitter. Wirelessly transmits the data from the transducers to the displays.-T911 Retractable thru-hull speed and temperature transducer. 6m cable.-T912 Retractable thru-hull depth transducer. 6m cable. The T111 wireless display receives information wirelessly. It has solar power with up to 300 hours of autonomy. Display two lines of information simultaneously with large 20mm reader. Simple to configure with 3 levels of backlighting. Lightweight (only 230 grams) and totally waterproof (submersible up to 10 m) and resistant to dust and corrosion. Compatible with other manufacturers via NMEA (optional). It can display all kinds of useful data for navigation and regatta such as: depth, water temperature, speed, both on land and on water, wind direction and speed, both real and apparent. , bearing, distance to waypoint and more. It can display average, maximum and instant values. It also has programmable alarms.