It looks to me like these are the only responses.
This is a Humminbird Wish List item and not a question, however I also think that this would be a great additional feature for the Humminbird products. Since fish will relate to different types of bottom, being able to show the relative hardness of an area you have mapped could be beneficial to finding that productive water when you need to. Just another tool in the ole fisherman’s toolbox. Please note that this is only possible with the “Pro” version of AutoChart and then only if you build the map from sonar recordings.