Following the instructions, I installed the update in my unit and restored my Autochart SD card to it's original format but was pulling my hair out because my maps (which I previously created using the work-around) wouldn't show up on my unit. Then I found out that, under the Chart tab in your unit's main menu, there is a selection for Base Layer and the choice is either default or AC. When I select AC, I get my maps. However I can't apply this setting permanently. Every time I start up, i have to reset it back to AC. What's up with that?? Anyone else experiencing this?