There are many different types of GPX. What is your model? Can you tell me the model so that I can send you the instruction. Usually, it is the pretty much the same with all models on how to set and turn on alarm
Press and hold alarm button, press Hour button to adjust hour and Minute to adjust minute to set an alarm, and release the Alarm button after setting the time. With the basic model, adjust the auto/off/on switch to the auto position to activate the alarm and turn on volume/buzzer dial to either set the alarm volume or set it to buzzer mode. With other models, hold the AL1 or AL2 button and press the Am/Fm/Aux button to wake to the buzzer of the current radio settings.
Or let me knnow model, I will send you step by step based on your model.
on Oct 09, 2013