FishMark 640C is a discontinued product

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Ultra-bright, 5" (12.7 cm) diagonal screen
High-definition 640Vx480H resolution
Depth capability to 800 ft* (244 m) with 1500 watts of peak-to-peak power (187W RMS)
High-performance, low-profile 200 kHz Skimmer® transducer with built-in temp sensor delivers up to 60° of fish detection area with high sensitivity settings - Operates at boat speeds up to 70 mph (61 kts) - Variety of other transducer purchase options available
Trolling speed and distance log readings available with purchase of an optional sensor
Adjustable ping speed with automatic HyperScroll™ to display fish targets at higher boat speeds
FasTrack™ vertical bar flasher displays real-time sonar returns and relative strength of each target
Advanced Signal Processing (ASP™) automatically adjusts your settings for the best sonar picture
COLORLINE™ separates fish from nearby structure and bottom, and helps define bottom composition and hardness
Advanced Fish I.D.™ shows underwater targets in different sizes of fish symbols
FishTrack™ displays target depth readings above fish symbols
Selective on/off sonar alarms: Shallow, Deep, Fish and Zone
Rugged, reliable, completely sealed and waterproof casing, even for use in harsh saltwater environments
Full one-year warranty