GPS jamming in Baltic Sea

[captnandy]

Does anyone have recent experience of the GPS jamming and disturbance in the Baltic Sea? I would like to know what kind of behaviour to expect on a boat's navigation system. I have heard that the jamming is designed to affect aircraft, and so maybe the affect at sea level is minimal? Is there any way to tell if you are being affected, if the disturbance is not so great that it is obvious? Is a chart plotter intelligent enough to know if a GPS signal is corrupted?

We are planning to sail to Klaipeda (Lithuania) and Gdynia (Poland) this summer, each either side of Kaliningrad, as well as the East coast of Sweden, where there have been reports of GPS jamming around the southern end of Öland.

Thanks for any information or advice!

Andy

[Zanshin]

I've been following the German articles on this subject. Unfortunately, the GPS signal is relatively weak and easy to spoof and a chart plotter can't detect if it is being spoofed - the software engineers weren't tasked with that problem. But for those of us who remember when GPS had "selective availability" we have a bit of distrust remaining from those days.
While I use GPS for all my navigation, I still plot my position on a paper chart as a backup. When far from land those plots are pretty far apart, but in a place like the Baltic it is prudent to do this more often. If your chartplotter suddenly tells you that you have suddenly travelled at 200Km/H or jumped miles from your last fix then it is time to put that last fix on a paper chart and look at your compass for a heading rather than the GPS.

[Dockhead]

I sail in the Baltic and haven't experienced any jamming.


But it would be good to be prepared to navigate the old-fashioned way. Take a hand bearing compass or compass binos and fresh up on taking three point fixes.