Anybody have any experience with this fishfinder/GPS combo. I have found it for what I think is a really good price: $150 brand new. From what I have learned on here and other places, 240 x 240 pixels is not bad resolution so I think I would be happy with it. Really looking for some details on the GPS part of the unit. I would just have to buy a antenna right? Just looking for some firsthand experiences/opinions. Thanks in advance.