the hyperlinks are without context. Are they part of the dive planning? Just advertising? Some words such as "And also take a look at these fine sites..." "Or the best gear at dirt cheap prices is available from..." will give it some guidance as to why you included those. Also, ask for permission to do so unless you already did and even if you do not really have to. Also, add in fine print at the bottom that you are not responsible for the contents of linked sites. I understand that this one script is a hobby project, but there are some whacky people out there that will sue you for any pointless reason...if they have one at all.
PHP links moved below in the usual "credits" section. Dive links put above. Am already advertising the TDP on NC Divers and have let the Dive Shop know about it. Since I'm helping them build their marketing, I give myself permission. :)
Add link to SF code.
Removed other links.