How do I lift the navigation restriction in my Restricted Private Pilot License (PPL)?

You may submit an application for a PPL (without navigation restrictions), if you have completed at least 5 hours of solo flying on cross-country flights. The 5 hours of solo flying should include a flight not less than 150 nautical miles, during which the holder has to make two intermediate stops within a day. One of the two stops made must be at least 50 nautical miles away from the aerodrome of departure.