I paid an additional $20 and upgraded to the striker PLUS 4 to gain Quickdraw contours, so I could create my own maps. Highly recommended. It's a great little unit. For the price I don't think anything compares.I have the Striker 4 also. Nice sounder, but would not recommend. No maps. You can build waypoints, etc. but no built in map. If maps are not needed, good unit.