With this short article I will try to explain how you can create a GPS track, directly on your PC, to upload on your device and then follow it during an excursion in selected locations. This could be especially handy if you have not been able to locate on-line tracks that meet your needs created by other users. In this way, you can draw a custom path, to study short cut or deviations from the main track and assess elevation gain and distances to fit our training. Expect always some unexpected and plan therefore an emergency alternative, especially if the area of interest is located high on the mountains. At the end of the article you will find a video tutorial (unluckly only in Italian) that shows you the steps to follow once you've loaded Google earth.