I just wondering about this. I bought the HD Ultra map with my 93SV about 2 weeks ago. It cost me $200. No lake in my area is on the Ultra map and the only thing extra it gives is the fisheye screen. So I know I got screwed, or I feel I did since I didn't know at the time it's possible to look this info up on the Garmin site. Now Garmin releases a new onboard map update. My unit won't take the upgrade due to lack of memory. I can only run one map chip card, so I'm wondering which map is better and more detailed. I'm afraid I may have got double screwed out of $200. Does anyone know the difference in the new upgrade, and the Ultra HD map you buy?