Fishfinder NAVMAN FISH 4200sx. Big name-big fish!

Largest screen with four level greyscale FSTN
3.5 x 2.5" [92mm x 61mm]
High resolution (160h x 120w pixels)
Sonar & History display
Nav mode featuring Large Digital readout
Totally watertight (IP67)
Digital Petrol Computer Option - requires optional fuel kit
Depth readings to 180m (600ft)
Boatspeed (1 to 50 knots or equivalent in mph, kph)
Simple menu driven access to functions
NMEA 0183 output to another Navman repeater (eg REPEAT3100 or Chartplotter) or any compatible instrument. (DBT, DPT, PTTKD, XDR, PTTKV, vHW, MTW)
Alarms: Fish, Too Shallow, Too Deep, Temperature (value and rate of change), Low battery, low petrol level*
Battery voltage display and low battery alarm
Zoom capability of 2X up to 100X for best view of details
Easy to monitor bottom with Bottom Lock and 'White Line' technology displayed in 4 levels of greyscale
Log trip distance or total distance (0.0 to 99999.9 units)
Auto Range and Auto Gain
Full compatibility with all Navman transducers
Choice of 9 languages (English, French, German, Italian,
Spanish, Dutch, Swedish, Finnish & Portuguese)
Engine hours displayed (0.0 to 99999.9 hours)
Water temperature (0.0 to 37.7° / 32.0 to 99.9°F )
Graph plots water temperature for last 40 minutes