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Search took 0.00 seconds. Search: Posts Made By: goboatingnow
Forum: Marine Electronics 21-05-2013, 15:07
Replies: 526
Views: 46,983
Posted By goboatingnow
Mine would be a ' Dalek' type announcement (...

Mine would be a ' Dalek' type announcement ( geting increasingly hyper ) , Collision imminent , Collision imminent Collision ........

Dave
Forum: Marine Electronics 21-05-2013, 01:26
Replies: 526
Views: 46,983
Posted By goboatingnow
Given the number of slots available docked...

Given the number of slots available docked vessels take up a tiny bandwidth. It's unlikely they are any sort of significant loading on the AIS bandwidth even in quite large numbers

Dave
Forum: Marine Electronics 20-05-2013, 17:03
Replies: 526
Views: 46,983
Posted By goboatingnow
Yes nick , but it em ,never passed any real...

Yes nick , but it em ,never passed any real certification ahem ahem.

Dave
Forum: Marine Electronics 20-05-2013, 16:46
Replies: 526
Views: 46,983
Posted By goboatingnow
Yes a further message type 23 has to be sent. To...

Yes a further message type 23 has to be sent. To continue the quiet period.

Note also that all AIS devices when they start operating in autonomous mode , ie with no other Tx in range either reset...
Forum: Marine Electronics 20-05-2013, 16:16
Replies: 526
Views: 46,983
Posted By goboatingnow
That wouldn't be the SR 261 would it , ahem...

That wouldn't be the SR 261 would it , ahem certification ahem

Dave
Forum: Marine Electronics 20-05-2013, 16:09
Replies: 526
Views: 46,983
Posted By goboatingnow
Ah hah Dave

Ah hah

Dave
Forum: Marine Electronics 20-05-2013, 15:52
Replies: 526
Views: 46,983
Posted By goboatingnow
Class B can receive text messages but cannot send...

Class B can receive text messages but cannot send then


Equally class b can respond to interrogations not not generate then , so I wonder Nick how your system is doing that. ( or is it a local...
Forum: Marine Electronics 20-05-2013, 15:44
Replies: 526
Views: 46,983
Posted By goboatingnow
No class B can receive safety text messages if...

No class B can receive safety text messages if the unit says it can display them

Dave
Forum: Marine Electronics 20-05-2013, 15:19
Replies: 526
Views: 46,983
Posted By goboatingnow
Here's the full extent of class control ...

Here's the full extent of class control

2.1.2.2 Assigned mode
An “assigned” mode for operation in an area subject to a competent authority responsible for traffic monitoring such...
Forum: Marine Electronics 20-05-2013, 14:41
Replies: 526
Views: 46,983
Posted By goboatingnow
Sorry slightly poor English. I really ment...

Sorry slightly poor English. I really ment relying on these tiny displays like on the SH or icom units. Not that the unit itself was poor , SH makes really great kit.
Forum: Marine Electronics 20-05-2013, 13:27
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

Also Evans I wonder where you in an area where AIS class B was commanded to lower reporting levels. Hence your device might report them as missed slots.

Its also worth noting that class B can be...
Forum: Marine Electronics 20-05-2013, 13:09
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

Paul. I really think that the leisure market has been badly served by poor AIS receive only units , like the Standard Radio displays, and even the SIMrad and Vesper units. Heres why.

AIS on...
Forum: Marine Electronics 20-05-2013, 12:51
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

Yes but that only refers to calling channels , there is no specific control of other channels, but yes of course we all would agree that unneccessary VHF traffic should be avoided,

AND i have...
Forum: Marine Electronics 20-05-2013, 12:45
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

It isnt a 'commons' issue because the 'commons' simply is huge, there is no scarce resource here . There is no tragedy.

Evans had two issues

(a) Too many alarms from static class B boats
...
Forum: Marine Electronics 20-05-2013, 12:29
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

bump , why very interesting discussion on AIS protocols etc, v interesting.
Forum: Marine Electronics 20-05-2013, 12:13
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

I think at this stage all you can summarise is that the likelyhood of Class B <2Kts transmissions have virtually no demand on the available bandwidth and that they , unless in huge numbers, have any...
Forum: Marine Electronics 20-05-2013, 11:26
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

Thanks Paul, stopped me having to read through my notes !.

I think we can clearly see that class B , especially class B stopped has a tiny bandwidth demand. I mean there are in excess of 12000...
Forum: Marine Electronics 20-05-2013, 11:12
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

sure, many about in Europe now, but in itself collecting such data tells us little about the slot utilisation, and thats whats needed.

dave
Forum: Marine Electronics 20-05-2013, 11:07
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

While its useful, as a research issue, what we really need is the maths behind the probability of class B gaining access to the slots. without that the raw data isnt much use as you can draw no...
Forum: Marine Electronics 20-05-2013, 10:57
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

Which backs up the point that channel capacity is not seriously impacted by non-moving class B transmissions, but is by moving Class A, ( I wonder is teh navastat info is used to justify what rate A...
Forum: Marine Electronics 20-05-2013, 10:41
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

Yes indeed, one of teh issues is that AIS was never intended as a vessel tracking system, nor was it originally even intended to be extended to non compulsory fit vessels.

Hence the issues.,...
Forum: Marine Electronics 20-05-2013, 10:38
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

Yes I know, its obviously a copy of your post ( on the ipad you cant easily selectively quote) :thumb::thumb:

dave
Forum: Marine Electronics 20-05-2013, 10:26
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

Evans

Total AIS targets: 146. This consisted of:
5 Base Stations
114 Class-A
28 Class-B

Of the Class-B transponders,
3 were moving faster than 1 kt,
6 were between 1 and 0.1 kt,
Forum: Marine Electronics 20-05-2013, 10:16
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

agreed, I dont have any issue nor do I think any have, in generally applying a provision that it is "good practice" to power down your AIS when you are finished with your boat.

However AIS was and...
Forum: Marine Electronics 20-05-2013, 09:55
Replies: 526
Views: 46,983
Posted By goboatingnow
Re: Please turn your AIS off when docked/moored/anchored

I dont see anyone many ascertion of 'millions' of vessels, You must remember that teh system was designed around Class 'A' or more correctly the SOTDMA protocol. ( which goes back to the early days...
Showing results 1 to 25 of 65
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