Used Humminbird unit (plus transducer and everything in photo). It is capable of both side imaging and down imaging (also obviously traditional sonar). I'm getting rid of it because the internal GPS receiver seems to not be functioning as my charts were non-operational. I called Humminbird to have them troubleshoot it with me and they concluded that the GPS receiver is likely dying. They said it is possible that doing a software update to the unit could get it working again, so whoever buys it may want to try that. I just decided it's a good excuse to push me to get a new unit though. Humminbird also said that I could send the unit in to be serviced for about $250 in order to get the GPS receiver working again.