Thank you for the response anyway! I do review my comments every so often to catch these. How do you know so much about GPS and how can I learn more? :) Also,

Thank you for the response anyway! I do review my comments every so often to catch these. How do you know so much about GPS and how can I learn more? :) Also, is there any hope for "authenticated GPS" to prevent spoofing? Is that even technically possible for non-secret codes like C/A or L5?