is indeed interesting and would be nice if it has more redundancies and could be used in addition with GPS. I agree with Stumble that it is unlikely that the U.S. would turn of GPS however the real problem is that too many use GPS as their primary method of navigation
. GPS should confirm what you have plotted on charts
using traditional methods.
Situational awareness is essential. Too many check the GPS at most once an hour and if it isn't working they are lost
. There are many reasons that may cause GPS to not work including electrical
failure, faulty data, etc. Worse, the GPS itself could cause false readings. Recently the British MOD (ministry of Defense) announce that during a recent two week exercise GPS might not work or worse, IT MAY PROVIDE FALSE SIGNALS! Think James Bond in the Tomorrow Never Dies. This isn't just Hollywood though and recently the Iranians may have brought down one of our drones by doing just this. Also, at the University of Texas
, a professor and his students found they could take control of drones by modifying GPS. Admittedly this hasn't affected yachtsmen much if at all but it would be nice to have something that provides redundancy.
There is another way to provide redundancy and that is to use what is tried and true; charts
and a sextant when taking long cruises. If nothing else, you can use them if the GPS fails and you have situational awareness.