 how to change from miles to kilometres and back on your Garmin watch. First press and hold the middle left button to access the settings menu. Scroll up or down until you reach system and then press the top right button. Inside the system menu scroll down until you see format. Press the top right button to enter the format menu and you should see units. Now before you do anything else make sure to subscribe to the Film My Run channel. Once in the unit menu you can select distance with the top right button. Then you can choose miles or kilometres. Press the bottom right button to go back and then select pace and speed. Here you can also select miles or kilometres. Finally go back and select elevation. This time you can select feet or meters. So now you know.