Jump lead places an Augmented Reality line on the water. You input the distance you want the line to be at.
The app requires you to place a "reference image" on a table or a tripod so that your iPhone can do all the magic.
These are the steps:
1)Upload the reference image you want to use and its precise physical dimensions.
2)Provide the coordinates of the image relative to the ramp. If you dont have them the app provides a rudimentary teodolite that lets you calculate them with your iPhone.
3)Start using the line!
The app can also be useful for coaches who want to see how far their athletes are jumping. No need for an expensive Splash Eye.