In order for the NavTracker software to work properly, the computer you have installed Navtracker on, needs to minimum have enabled access to the following servers:
MINIMUM (Low-bandwidth mode):
To test the connection you can enter the below URLs in Internet Explorer on the same computer, and verify that they are opened successfully
https://navstorage.navtor.com/Connection.svc
https://navserver2.navtor.com/navtracker-backend/api/v1/diagnostic/check-connection
For full view of Navtracker with all map options, also the additional maps/services below needs to be enabled in your firewall/network:
ADDITIONAL MAPS/SERVICES:
http://dev.virtualearth.net (Political/Satellite - Bing maps)
http://ak.dynamic.t0.tiles.virtualearth.net (Political/Satellite - Bing maps)
http://ak.dynamic.t1.tiles.virtualearth.net (Political/Satellite - Bing maps)
http://ak.dynamic.t3.tiles.virtualearth.net (Political/Satellite - Bing maps)
http://ak.dynamic.t4.tiles.virtualearth.net (Political/Satellite - Bing maps)
http://ecn.t0.tiles.virtualearth.net (Political/Satellite - Bing maps)
http://ecn.t1.tiles.virtualearth.net (Political/Satellite - Bing maps)
http://ecn.t2.tiles.virtualearth.net (Political/Satellite - Bing maps)
http://ecn.t3.tiles.virtualearth.net (Political/Satellite - Bing maps)
http://services.arcgisonline.com (Nautical - Esri maps)
https://backend.navionics.com (Nautical - Navionics Maps)