Most satellite navigation systems are capable of using GPX file formats for Points Of Interest (POI) files. Some will support this directly whilst others will require the GPX file to be converted to something your particular brand of system will understand.
Your user manual should contain information on how to do this if you look under the section for POI's. If you need to make use of some form of converter to change the GPX into something else the software to do this normally either comes with your system or is available from the manufacturers website. Both should be free and come with detailed instructions on how to accomplish this task.