I recently pruchased a Garmin 160 Blue from Boaters World in Everett. It was taken off the display as it was the last one available. The simulation mode shows fish as arches. However, it is displaying only dots off of Mukilteo with a good bottom. When I turn on the fish symble it shows fish symbles. I have turned off all other electronics and checked the installation. I am curious if they are overselling the unit with the nice well defined arches in the simulation mode. I apprecate anyones impute. Thanks