Forget to end your surf when you got our of the water?  Don’t worry, you can “crop” the length of your session.

Navigate to SURF VIEW > EDIT YOUR SURF > Crop Your Surf.

In 2-3 percent of surfs you may see a wave in a place there should not be one. Poor reception may have caused the satellites to "misplace" your watch for a few seconds and draw an "error wave". 

CROP SURF can also be very useful if you accidentally track your drive home.