Northstar 490-D Echo Sounder

Selling a new in the box Northstar 490-D 1000 watt echo sounder, because it does not fit into the existing system. Never used, with all cables, installations and manuals, 100% new and working! This black box works with Northstar 6x00i, M84 or other fishfinders, to be used with a 1kW transducer.An echo sounder produces high-voltage electrical pulses that the transducer converts into sound waves (called "pings"). The sound waves are sent downward through the water. When a sound wave hits and reflects off an object, such as a fish, debris, seaweed, or the seabed, the reflected sound wave (an "echo") returns back to the transducer (not included) along an imaginary vertical line called a "water column". The transducer converts this echo into a tiny electrical pulse. The 490 digitizes these pulses and sends them to the navigator, so that echo sounding pictures of the water and seabed can be displayed and analyzed on the echo sound screen. This system lets you see real-time cross section of what's happening underneath your vessel. Designed to be used with a transducer having dual ceramic elements, one each for 50 and 200kHz. Northstar recommends Airmar 41-088-1-01 or Furuno CA50/200-12M or similar.  Measures approx. 10" long x 7 5/8" wide x 2 1/2" high. Includes installation manual, operations manual and warranty registration card. You are getting everything you see in the photo. Price: AUD 550 + shipping