maybe better
I have the free version as well and have been using it for two years. Unfortunately the pro version gives different information, different tide heights etc. This makes for a confusing tool. It also does not present its information as well as the free version. They did respond to my email about this but they gave a lame reason for the discrepancies. I will stick with the free version which has been very accurate as far as I can see.
sophie270 about
Tide Graph Pro