Ships have ADSB sort of !
Thread Starter
Join Date: Jan 2008
Location: Australia
Posts: 768
Likes: 0
Received 0 Likes
on
0 Posts
Join Date: Feb 2006
Location: Aust
Posts: 378
Likes: 0
Received 0 Likes
on
0 Posts
Actually, it's 100 times better then ADSB. It's called AIS and not only does it display a position in relation to you, but it also gives its lat and long, whether it's underway with its speed, it's departure and destination port, the vessels name and also the position on the vessels the transponder is located. All on a ship that is likely to do only 30 kts....
Marine electronics are pretty advanced compared with aviation. For example, my boat's VHF has SELCAL built in, can send text messages, can simultanously receive three frequencies, is waterproof to a depth of 2 metres, can vary it's transmit power to prevent unwanted chat, can receive GPS position and time info and will send an automatic distress message if required complete with position every five minutes until either the boat sinks or the battereis run out.
And it costs about a fifth of an aircraft's VHF set.
And it costs about a fifth of an aircraft's VHF set.
Join Date: Nov 2007
Location: Mars
Posts: 373
Likes: 0
Received 0 Likes
on
0 Posts
Heres the amateur version - just click on a ship.
Live Ships Map - AIS - Vessel Traffic and Positions
Live Ships Map - AIS - Vessel Traffic and Positions
Been using AIS on my yacht for Three years - its a $200 receiver that hooks to my VHF antenna via a splitter and runs a 38400 baud RS232 output to my chart plotting computer.
AIS targets are overlaid on my charts and the time and distance of closest approach is computed in real time. Anything that looks like its closest approach is within my preset range ring appears in red.
Only issues - updates are every Two minutes. Vessels under 500 tons are not required to carry AIS class A tranceivers. At least half the merchant ship fleet don't give a f*** about anything smaller than they are, they work on the "big ocean" theory, set the autopilot and go to sleep.
AIS targets are overlaid on my charts and the time and distance of closest approach is computed in real time. Anything that looks like its closest approach is within my preset range ring appears in red.
Only issues - updates are every Two minutes. Vessels under 500 tons are not required to carry AIS class A tranceivers. At least half the merchant ship fleet don't give a f*** about anything smaller than they are, they work on the "big ocean" theory, set the autopilot and go to sleep.
A question for you mariners who seem to know about this stuff.
Ignoring cost, how easy/hard would it be to fit ship and oil rigs with ADSB (and maybe VHF repeater stations) so that aircraft can be ADSB identified oceanic. i.e. out over the Indian ocean and across the Tasman? Would there be enough maritime activity to make it work?
Sorry that's 2 questions.
Clark y.
Ignoring cost, how easy/hard would it be to fit ship and oil rigs with ADSB (and maybe VHF repeater stations) so that aircraft can be ADSB identified oceanic. i.e. out over the Indian ocean and across the Tasman? Would there be enough maritime activity to make it work?
Sorry that's 2 questions.
Clark y.
Those new-fangled marine gadgets aren't all they're swept up to be:
Brothers rescued after boat hits rocks - ABC News (Australian Broadcasting Corporation)
"The GPS wasn't reading correctly and the next minute I look up into pitch black- there was no moon- and there's white water in front of me,"
Don't think its practical, furthermore ADSB relies on a "squitter" transmission every Two minutes or so. I'm not sure if there is the bandwidth to handle aircraft since you would need to transmit at less than 30 second intervals to get a meaningful track.
Ohhhhhh this warms the heart
All been said before.
Seriously! If this kit was available about twenty years ago, my best mate's dad would probably still be alive. His trawler was run down in the middle of the night by a container ship. All that was left on top was a slick a navigation light board and a scratch on the hull of the ship.
All been said before. Seriously! If this kit was available about twenty years ago, my best mate's dad would probably still be alive. His trawler was run down in the middle of the night by a container ship. All that was left on top was a slick a navigation light board and a scratch on the hull of the ship.
Join Date: Sep 2008
Location: australia
Age: 66
Posts: 45
Likes: 0
Received 0 Likes
on
0 Posts
Just like in flying, you shoudn't rely on the gadgets. Keep your position plotted on a paper chart and practice your DR skills so you have some idea where you are if the electronics don't.
Instead of being used to ensure a greater margin of safety, electronic nav gadgets are too often used to go to places you wouldn't have gone without them. I know because I'm guilty of doing it in the air and on the water. Lesson learned, lucky the bucket of luck wasn't empty!
Instead of being used to ensure a greater margin of safety, electronic nav gadgets are too often used to go to places you wouldn't have gone without them. I know because I'm guilty of doing it in the air and on the water. Lesson learned, lucky the bucket of luck wasn't empty!
via OZBUSDRIVER; ...If this kit was available about twenty years ago, my best mate's dad would probably still be alive. His trawler was run down in the middle of the night by a container ship. All that was left on top was a slick a navigation light board and a scratch on the hull of the ship.
.............
.
You are a Queenslander, Binghi have a look for the "Edward Thomas"
I had a look-see fer "Edward Thomas" ...seems a big look. Perhaps a few more key words would help..
.
The great thing about AIS is that it will set off an alarm and wake you up, if (as in my case), you sail solo and need to get shut-eye on passage.
It gives plenty of notice to allow avoiding action. Usually an early radio call to a ship will have them alter course if you need sea-room or are becalmed, hove-to etc. The officer of the watch is usually so bored he is quite happy to be given something to think about. Though English comprehension is sometimes an issue.....
The only problem with relying on AIS is that smaller vessels like trawlers and long-liners are not required to have a transmitter. They - to my mind - are more of a menace to a small yacht because there are more of them out there, they drag stuff miles astern and the crews are too busy fishing to bother with a look-out.
Aviation is safer by a long way.
It gives plenty of notice to allow avoiding action. Usually an early radio call to a ship will have them alter course if you need sea-room or are becalmed, hove-to etc. The officer of the watch is usually so bored he is quite happy to be given something to think about. Though English comprehension is sometimes an issue.....
The only problem with relying on AIS is that smaller vessels like trawlers and long-liners are not required to have a transmitter. They - to my mind - are more of a menace to a small yacht because there are more of them out there, they drag stuff miles astern and the crews are too busy fishing to bother with a look-out.
Aviation is safer by a long way.
