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Units:
You can change the units by
pulling down the menu and selecting Metric or English.
Location:
How do you think the path of your ball
will change at different altitudes? Try it out!
You can select a location
or specify an altitude by pulling down the the "location" menu. Choose
San Francisco (Elevation - sea level), Mexico City (2300 meters/7500 feet)
or Mount Everest (8800 meters/29000 feet) or enter an altitude after selecting
"Your Choice" on the Location Menu.
Height:
You can use the slider or enter the height the
racket makes contact with the ball.
Position:
You can use the slider or enter how far you are from the center
line on a tennis court or the pitcher's mount on a baseball field.
Speed:
You can use the slider or enter how fast the ball initially travels.
Spin:
You can use the slider or enter the spin rate in revolutions per minute.
Use positive (+) numbers for underspin (backspin) and negative
(-) numbers for topspin.