It I think you need to bring your sensitivity up a bit, what it looks like to me is a tree or at log with nothing around it. It looks like it is something that is really attached to the bottom that your unit isn't showing the full picture.
2015 Skeeter FX 21
...and down goes PhotoBucket with the new Terms of Service... I predict they will be out of business or begging for forgiveness inside a month. 6/30/2017