I have been looking around for a sub sea positioning system and it looks like nothing is nor open nor affordable. So I decided to try building a proof of concept!
From all classic systems, I feel like the Intelligent Buoys is the simplest to deploy. I then started to play with the gps receiver I had received a few weeks ago. I plugged it into the arduino and could read the serial data!
I was quite happy and satisfied with this experiment until I compared the data with the iphone's gps...
As you can notice, there are serval minutes of difference between the two, and it seems to me quite a lot!
Does any of you have an idea why?