I believe if you fish multiple lakes throughout the year maps would be a good tool. If you fish 2 or 3 lakes don't think it's that important as long as you can save waypoints. It all depends on what you want to spend. I know the only big difference in the Garmin Striker series and the SV's today are the lake maps and they are about double the cost. I rarely use traditional sonar today unless I'm running down the lake. Downview is just more detailed once you determine what your looking at.