I just learned this from Garmin.
1. 6,700 HD lakes with 1 foot contours (that’s over 1,000 more than last year). Garmin has increased from 40 MaxDef lakes in 2014 to 72 MaxDef lakes. 55% increase. Also, current HD lakes support Auto Guidance features. This is not specific to Maxdef Ultra HD. That is way cool.
2. You will not find Auto Guidance from any other map maker or GPS manufacturer – Garmin holds the US patent on this feature in chart plotters.