Ive been using the free site Terpheels (a fellow albie owner) has.
It allows for you to scroll arond the SST chart and find exact waypoints and temperature. I also use it as a interactive chart to find distances.
They now have additional data available, guys are adding data on where the bite is located. You can give input also on where you found fish.
Check it out.
http://www.terpsstpro.com/php/
You must create a login.