I never get the slow blinking LED light on the “Function” button.

This is the main sign that your turfRad sensor is not getting a GPS location signal. There are a number of things to try to resolve this: 

1. Make sure the GPS antenna (black square box) is firmly attached to the port labeled GPS on the sensor and pointed upwards towards the sky 
2. Make sure you have a clear view of the sky, you will likely not get GPS lock in a metal-roofed maintenance facility. 
3. It can take up to 10 minutes to obtain GPS lock on your first install when the sensor has moved a long distance since last obtaining a fix. 
4. Check that there are no pinches or dings in the GPS antenna wire. Deformations or small breaks in this cable can compromise the low power GPS signal. If you need a new GPS antenna please request one from support@terraradtech.com.