If you want to open this project to its exact location in Google Earth, enter the latitude and longitude values.

Use this feature. When creating the custom activity, you must enter [EarthLocation] (exactly as shown) in the Command-line field of the Custom Activity Editor dialog box.  No matter which format you enter, Project Center converts all latitude and longitude values to decimal degrees.  If you enter values in the Location and the Latitude and Longitude fields, Google Earth uses the latitude and longitude values. You can use Google Earth to find the latitude and longitude of the project location.  If you enter the Location only, Google Earth will not go directly to the project location. You have to double-click the location listed in the Google Earth’s Places panel.  If no values are entered in the fields above, Google Earth will not go to the project.