Is there any limitation when using a device on the ground?

Using a gate on  the ground is useful in the following instances

1. 1. In a three ppoint start when you want to start on hand-lift

2. 2. In a  standing two point start where you want to start on foot-lift

3. 3. In a 5-10-5 test or similar where you want to measure splits as foot or hand touches a line

Limitations exist in the following paradigms

1. 1. A gate on the ground makes a poor wifi access point See:  What is the Maximum     Distance between iPad and the Access point Timing gate?

2. 2. Generally a UNO device is used for Sensing on the ground, because;

   • • It’s laser sensor is lower than a dual beam gate (You would need to disable the top beam in a dual beam gate)
   • • It is more stable, particularly if the magnetic ground plate accessories are used.