Transmitting AIS with Garmin - Page 2

willk · 27 March 2021, 21:51

Quote:

Originally Posted by mikehhogg

I hate to be the one to be negative here but AIS is not all its cracked up to be. signals and data are sometimes intermittant and hours behind real time.

How are you accessing this AIS data, Mike? If it's via an online app such as MarineTraffic then the issues are nothing to do with AIS, but the methods of gathering and disseminating that data.

mikehhogg · 27 March 2021, 21:57

I have AIS reciever linked to PC

willk · 27 March 2021, 22:03

Quote:

Originally Posted by mikehhogg

I have AIS reciever linked to PC

Here - grab this, it'll be useful in a mo...

mikehhogg · 27 March 2021, 22:06

?????

mikehhogg · 27 March 2021, 22:39

Ais is not a recognised collision avoidance system and is not compulsory so you may have ais in your rib and the oil tanker coming your way you may not,or may decide to switch it off, your ais may be receiving your data from a vts system wherein lies the problem of delays in transmitting the information

willk · 27 March 2021, 22:48

Quote:

Originally Posted by mikehhogg

Ais is not a recognised collision avoidance system and is not compulsory so you may have ais in your rib and the oil tanker coming your way you may not,or may decide to switch it off, your ais may be receiving your data from a vts system wherein lies the problem of delays in transmitting the information

C'mere, you might wanna keep a tight grip on this too:

jakew009 · 27 March 2021, 22:56

Quote:

Originally Posted by mikehhogg

I hate to be the one to be negative here but AIS is not all its cracked up to be. signals and data are sometimes intermittant and hours behind real time. we purchased a boat a few weeks ago and used marine tracker to track its progress. the cargo ship that was going to pick it up from an Island off south west coast of uk Stopped transponding after leaving port in penzance.The boat was on the quay the following day even though ais showed it under way at sea.
the boat was transported by road to liverpool where it was put on a ferry to belfast. The stenna ship appeared in the irish sea when in fact it was docked in belfast.. We then had a trawler off the the Irish coast that suffered engine failure and the LE George bernard shaw a naval vessell attended .Ais was 24hours behind. I rest my case

This is just total crap. The AIS system itself is extremely robust and the licensing to get hardware certified is so strenuous that most companies don’t bother and just buy in the hardware from a handful of companies actually making the gear.

The reason that your tracking was rubbish was that you were presumably relying on Marine Traffic or similar which basically relies on a bunch of volunteers living near the coast to stick a vhf antenna on their roof plugged into a computer streaming the data back to Marine Traffic. It’s hardly a surprise that what you get is a bit flaky but it wasn’t what AIS was designed for.

jakew009 · 27 March 2021, 22:57

Quote:

Originally Posted by mikehhogg

I have AIS reciever linked to PC

That’s only going to have a range of 50 miles or so max? So you can’t have been using that to track the vessel from Liverpool to Penzance.

jakew009 · 27 March 2021, 22:59

Quote:

Originally Posted by mikehhogg

Ais is not a recognised collision avoidance system and is not compulsory so you may have ais in your rib and the oil tanker coming your way you may not,or may decide to switch it off, your ais may be receiving your data from a vts system wherein lies the problem of delays in transmitting the information

That’s total crap too
https://www.imo.org/en/OurWork/Safety/Pages/AIS.aspx

mikehhogg · 27 March 2021, 23:02

what really gets on my goat is all these ribs that think that they are ocean going tankers.

mikehhogg · 27 March 2021, 23:08

Quote:

Originally Posted by jakew009

That’s only going to have a range of 50 miles or so max? So you can’t have been using that to track the vessel from Liverpool to Penzance.

penzance and liverpool were two totally different ships

mikehhogg · 27 March 2021, 23:09

Quote:

Originally Posted by willk

C'mere, you might wanna keep a tight grip on this too:

Bend over I think it will fit

mikehhogg · 27 March 2021, 23:14

Fishermen all over the world are fitting AIS transponders to their nets and fishing gear in order to get vessels to steer clear of their gear. But maybe the experts here think this is crap too

willk · 27 March 2021, 23:15

Quote:

Originally Posted by mikehhogg

Bend over I think it will fit

How rude!

jakew009 · 27 March 2021, 23:21

Quote:

Originally Posted by mikehhogg

penzance and liverpool were two totally different ships

You said you picked up the delayed AIS transmissions from a receiver connected to your PC?

Pikey Dave · 28 March 2021, 01:01

Quote:

Originally Posted by mikehhogg

I have AIS reciever linked to PC

Oh dear

GuyC · 28 March 2021, 08:25

I might see if I can get a lifetime first class ticket out of BA by suggesting they can use Flightradar24 rather than spending all that money on navigation equipment.

mikehhogg · 28 March 2021, 13:50

AIS is not GMDSS approved and is limited to as low as 2.5 miles depending on antenna,also a fishing kayak could theoritically purchase a transponder and register it as a tug boat. along with the fishermen attaching ais transponders to their fishing gear makes this piece of kit kind of waste of money in a rib. as well as having to stop the rib to read every ID that appears on the screen. but it appears that people are willing to throw a lot of money at gadgets and cut a milk carton in half to make a bilge pump. No wonder the RNLI are busy

willk · 28 March 2021, 14:31

Quote:

Originally Posted by mikehhogg

I hate to be the one to be negative here but AIS is not all its cracked up to be. signals and data are sometimes intermittant and hours behind real time. we purchased a boat a few weeks ago and used marine tracker to track its progress. the cargo ship that was going to pick it up from an Island off south west coast of uk Stopped transponding after leaving port in penzance.The boat was on the quay the following day even though ais showed it under way at sea.
the boat was transported by road to liverpool where it was put on a ferry to belfast. The stenna ship appeared in the irish sea when in fact it was docked in belfast.. We then had a trawler off the the Irish coast that suffered engine failure and the LE George bernard shaw a naval vessell attended .Ais was 24hours behind. I rest my case

This was your original observation about AIS. It shows that you have a very hazy concept of what real AIS and "internet AIS tracking" are and how they are (not) related. You can play catchup about GMDSS and whatever, but this post is what it is - mostly nonsense.

Real AIS works just fine. IMO, it's a shame that you have decided to have a pop at a widely used safety system used extensively by the CG, the RNLI, etc.

mikehhogg · 28 March 2021, 14:34

Quote:

Originally Posted by willk

This was your original observation about AIS. It shows that you have a very hazy concept of what real AIS and "internet AIS tracking" are and how they are (not) related. You can play catchup about GMDSS and whatever, but this post is what it is - mostly nonsense.

Real AIS works just fine. IMO, it's a shame that you have decided to have a pop at a widely used safety system used extensively by the CG, the RNLI, etc.

sorry to burst your bubble wilk but I got this info from the RNLI