If you’ve run aground in soft mud and she won’t back off the way she went on, try spinning her 180 degrees around on her keel. Once turned, you should be able to blast off the mud into deep water because a standard propeller delivers more power ahead than astern. What’s more, if you’ve a raked fin keel, it may well be digging into the mud like the barb of a fish-hook if you try simply to ‘back up’, which means that going ahead into deeper water will be a lot easier.