Dense materials (such as concrete, rock, steel, heavy wood), tall buildings, terrain features (like mountains, ridges, and cliffs), and large trees can block or degrade GPS signals and may make it impossible to determine your location. It is well known that the ordinary Global Positioning System (GPS) fails to provide location and time information under water. The reason is that the electromagnetic signals from the orbiting satellites are heavily damped in water and hence can not be detected by the receiver in most cases of interest.

              Therefor GPS device used in US Airforce Navy Marine Army must work without GPS signal without internet without cell phone signal and any other radio signal.

 

          If this map is NOT showing your current location ( instead showing London UK by defaultthat means you have not enable location service.  By default, Mac system privacy and browser both will block location service, you have to enable by any of these options.

        If browser popup a dialog window ask you if you want to allow or block your location, click allow

              OR Open Mac System Preference ---> Security & Privacy ---> Privacy --->  Location Services --->

 ---> check Enable Location Services   ---> check Safari or opera or chrome or what ever browser you are using.

 

Google Maps

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Leaflet

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