I'm sure they work great but in all honesty, the lakes I fish are probably too small to bother with a gps device.. besides, I learned these lakes contours by using my depth sonar over the seasons. If the fish aren't visible or cooperating on a small lake's hotspots, why would I bother with a gps
I could see if I were roaming miles in the backwoods or snowmobiling a huge inland body of water with the data map and all but, I doubt the device is worth such an investment on ponds or small lakes in my region. I think marking fish on my showdown is more important than a handheld GPS. Plus, I'm not buying no maps to install and find out the program does not have the small lakes I fish.