Plastimo AdvanSea S400 Multi Display (Part/Model number reference 90 80 102 002).
Dual-line marine digital instrument display combines speed, depth, and environmental data.
In good working order. Instrument only (no transducers). 
Compatibility: 
Direct plug-and-play drop-in replacement for Navman 3100 and Northstar 310 systems.
Compatible with speed sensor ref 40640 (with through-hull fitting)
Compatible with Airmar P319 transducer ref 61669
Technical Specifications:
Power supply: 10 to 16.5 V DC, operates under 150 mA with backlight active.
Water resistance: Screen rates IP66 standard against heavy spray and rain.
NMEA0183 input/output compatibility & proprietary AdvanSea bus interface.
Units : °F & °C - Feet - Metres - Knots - Km/hr - Miles/hr - V - Miles - Km
Display and Readability:
Dual-line amber 5-step backlit Monochrome LCD anti-fog transflective screen. Backlit keys.
Lower line : 22 mm high digits.
Upper line : 32 mm high digits
Depth and speed trend indication (depth when connected through NMEA0183)
Total and trip log
Elapsed time and countdown race timer
Water temperature
Surface speed high and low alarms
Low battery alarm
Simulation mode