Just got the HD and am shocked at how slow the gps is... the boat on the screen is a good one mintue behind the movement of actual boat on water. Verry frustrating trying to get on structure. Have tried re setting the settings under trails and routes to one second from auto but it didn't help much. I've had several 500 and 300 series lowrance gps with no problems. Any suggestions on speeding this up ..its taking 10 to 15 mintues to get on a piece of structure and im over it already!! On the flip side the fish finder is the best i've ever seen...