Name:   RadioActive - Subject:   Chartplotters / sonar with Lake Martin cartography Date:   1/7/2018 5:25:35 PM

Thanks to all that have replied.  After quite a bit of looking, it is indeed the Garmin unit that I intend to purchase.  For these old eyes, I think I am going to go with the 9" display, which I think is the 93MV Plus unit, or something like that. 

The Garmin unit does have built-in charts for Lake Martin.  It has 5 foot contours for navigation, and one foot contours for fishing.  Much better than paying for third party charts, plus as you've said, the updates are free. 

See you on the Lake.....

RadioActive...