I was on a warship that ran aground on an uncharted "rock" in the Malacca Straits in 1966, I know how these people feel! Looks like modern warships AIS is safe from hacking but ordinary commercial AIS is a different story.

conservativedailypost.com/investigators-reveal-new-fear-aftermath-navy-destroyer-accident-goes-viral/?utm_source=Facebook&utm_medium=CD&utm_campaign=Mark

The US navy are bringing back celestial navigation skills. Doesn't diminish keeping a good lookout for collisions though!

What about radar? My little 11yr old Raymarine plotter/radar will show AIS traffic but also shows radar returns that it can track, providing bearing/range/speed/course/CPA/TCPA. Before the AIS was installed when we had just bought our boat, the radar MARPA system worked a treat. E.g. Picked up a small fishing trawler a few miles out during low vis misty rain, adjusted course to steer clear and out it popped visibly 1/4 mile away.

www.npr.org/2016/02/22/467210492/u-s-navy-brings-back-navigation-by-the-stars-for-officers

Many radio data. links transmit their information by "spread spectrum". This means the transmitter shifts its frequency many times in a second (10000 maybe) and the remote receiver knows where to listen for the next transmission thanks to a coded key in the data so can recover the message. But an external person who wants to jam a link like that has trouble because he doesnt know what frequency when. If jyou try to "tune in" to such a signal you cant find it either. The GPS signal is like that and even better has multiple transmitters (satellites) so its hard to jam. AIS uses one HF frequency to transmit its data so is easy to jam or muckup with erroneous information intentional or accidental. So its not very safe.

This article is from Cornell Uni 2013 , bit technical but worth the effort, short answer is don't put your trust in only one source.
http://blogs.cornell.edu/yachts****/

or search "A Red Team, a Blue Team, and the White Rose"

maybe i should have a tech head in the race crew to stuff with the oppositions gadgets or we could revert to real navigation again

andy59 said..
Interesting article, goes to show nothing is foolproof, but I hope no one would be persuaded that an AIS transceiver is not one the best pieces of safety/navigational equipment you can have on your boat. Even if it is only 99.9% effective, hell even if it was only 50% effective, It makes a massive difference to know with certainty the course and speed of targets, even ones that are visible. In small boats anything you can do to increase your visibility is worthwhile, and nothing increases your visibility like constantly transmitting your position, course and speed.

fore while there Andy I thought you were rounding up beef cattle out in the India ocean doing circle work
watching you on the map

HG02 said..
fore while there Andy I thought you were rounding up beef cattle out in the India ocean doing circle work
watching you on the map

What are you talking about?

Ramona said..
The US navy is altering it's watch keeping system to ensure sailors get more sleep. What is interesting in the article is the US navy is going to install AIS!

www.navytimes.com/news/your-navy/2017/09/20/navy-issues-new-sleep-and-watch-schedule-rules-for-the-surface-fleet/

"We had a distorted perception of operational security, that we kept that system off our warships," he told the Senate Armed Services Committee during a Navy readiness hearing."

WTF!!! I thought they had the option to go silent with the AIS but I had no idea they were running around without AIS. Welcome to the 21st century US Navy, things should be a bit better for you now.