It seems most apparent in California dive reports but protecting dive locations by altering photos is common and smart in my opinion. In California there are often readily identifiable landmarks. Florida photos seem to be taken so far out at see that there is no concern of that.
Yesterday while at home sick I saw a report on GMA I think that said a lot of the new cameras and cell phones that have GPS capabilities are including the gps co-ordinates of the photo in the file information. I just received a phone from my wife the same day (Blackberry Torch) and it has this feature. Just thought I'd mention it so that you can be aware. It would be pointless to go through all the effort of visually editing a photo just to have the gps co-ordinates in the image properties. The good news is that the feature can usually be turned off.