customize the search value of GPS

In my application I would like to update the user's location on a map, unfortunately I noticed that with the GPS and using the "geolocation.watchPosition" the location is updated every 60 seconds. this value I found in the files ".java". how do I customize it?
if I change the file risk that the next update of the plugin "geolocation" this setting is overridden. how do I change that value without having to touch the file ".java"?