As OP hasn't replied yet, I'll take the liberty. The biggest issue is interference (jamming) by malicious actors. This is especially common in the eastern Mediterranean [1]. Earlier this year there have also been reports of interference on Finland's border with Russia [2].
Of course one could imagine other scenarios where GPS might become inaccurate or unavailable on a larger scale, such as an attack on the satellites themselves.
> The biggest issue is interference (jamming) by malicious actors.
And not necessarily malicious. Before I ditched Strava (insert separate rant about tech "ecosystems"), one of my bike rides took me near a nuclear power plant. The resulting GPS track had a sudden hundreds-of-feet "climb" near the power plant that didn't exist in the real world, as if I had literally climbed a wall on my bike.
in android, the GPS config file (some xml) file will do the trick of making the at least the GPS/Location system on the phone unreliable. Apparently each country has their own config file. Found this out when a friend used the Android bought in China in US. So no GPS is NOT reliable for critical situations, it is more a consumer connivence ATM.
I wanted to dim the chart plotter. I turned it off: was the same button, required a push of a different length. If I wasn't aware of where my bow was pointed and what I was trying to do at the time, it would have been a big problem, particularly in traffic. But because I knew where I was and what I was doing I was able to continue to sail and turn everything back on.
tawm|3 years ago
Of course one could imagine other scenarios where GPS might become inaccurate or unavailable on a larger scale, such as an attack on the satellites themselves.
[1] https://safety4sea.com/us-marad-gps-interference-incidents-r...
[2] https://www.traficom.fi/en/news/unusual-amount-reports-about...
(my guess is that _moof is a navigator with experience in the eastern med sea)
mortenlarsen|3 years ago
flyinghamster|3 years ago
And not necessarily malicious. Before I ditched Strava (insert separate rant about tech "ecosystems"), one of my bike rides took me near a nuclear power plant. The resulting GPS track had a sudden hundreds-of-feet "climb" near the power plant that didn't exist in the real world, as if I had literally climbed a wall on my bike.
deepstack|3 years ago
wbl|3 years ago