Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 16-11-2011, 15:47   #31
Registered User
 
bewitched's Avatar

Join Date: Sep 2009
Posts: 885
Images: 3
Re: AIS with Internet

Quote:
Originally Posted by Lancerbye View Post
You have container ships out there travelling at 25 knots ?
We do. And the high speed ferries (hydrofoils and turbocats) are doing about 35knots on the Hong Kong to Macau run. One every 5 mins or so.

For fun I googled 'average speed of container ship'. The first 3 results were:
Up to 25kts
21 to 25kts
23kts

So yes, 4 or 5 miles every 10 mins or so.
__________________

__________________
bewitched is offline   Reply With Quote
Old 16-11-2011, 16:10   #32
Registered User
 
bewitched's Avatar

Join Date: Sep 2009
Posts: 885
Images: 3
Re: AIS with Internet

Quote:
Originally Posted by AussieGeoff View Post
I'd refresh it at not more than sixty second intervals, so a cargo ship at 14kts will have moved around a 1/4 of a mile. Even allowing another thirty seconds for lag and a redraw, that's still well under a mile it will have moved.
But there are other factors adding to the inaccuracy. Like how often is the website updated? Every 30 seconds? Every minute? Longer? It's an unknown.

How old was the AIS transmission for a particular vessel when it was uploaded. How old is the transmission now? More unknowns.

To many unknowns for me to ever rely on it in any short range situation.
__________________

__________________
bewitched is offline   Reply With Quote
Reply

Tags
ais, internet

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Problem with AIS taku OpenCPN 4 03-10-2014 10:17
Collision Avoidance in Mexico: AIS or Radar or ? no_bad_days Pacific & South China Sea 27 19-09-2011 16:40
Route Properties, Missing Functions James Baines OpenCPN 13 13-07-2011 05:31
AIS Plus Other Goodies Windjammr Spirt Marine Electronics 0 10-07-2011 16:26
AIS Reception Issue twistedtree Marine Electronics 72 03-07-2011 04:57



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 21:44.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.