humminbird fishfinder 581i combo
front mounted internal gps allows in-dash mounting single front side sd card slot 5 mono fstn lcd 640v x 320h 16 level grayscale temp included gps speed included dual beam 83 khz 60 degrees amp 200 khz 20 degrees 250 watts rms 2000 watts ptp 50 channel gps unimap built-in navionics compatible