Thread: why GPS?????

so you may not need GPS but it's very useful.When you take snap shots on a si/di unit they have gps coordinates so you can go back to that spot,you can create waypoints,see your approx. mph(useful for trolling).... Even if your lake isn't on their map(the default one) you can still save coordinates.As far as screens go,the more pixels per in.,the clearer the screen(less pix-elated )and on the HB units you can change the pps(pings per sec.) hope this helps. btw 640x640 etc... just refers to the pixels per in. available in the screen but doesn't have anything to do with the imaging of the di/si sonar. On the HB you can change to a higher hz range to create a "clearer" image.