Go to the Overlay Data screen (where water temp is now missing) and click right arrow.
Scroll down to Configure and click enter.
Scroll down to Depth and click enter.
Scroll down to Add and click enter.
Scroll down to Sonar and click enter.
Scroll down to Temperature and click enter
Choose Water Temp and place X in that box.
Now click Menu until you can back out to where you can scroll down to Done Configuring.
Click Done Configuring and you are finished.
Good Luck..