Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 27-06-2016, 22:23   #1
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,071
Satelite AIS.

Been tracking my folks boat as the head up the coast of NZ. They have just fitted a normal class B AIS. I am finding that marine traffic seems to show them up fairly regularly via satelite even when they are well away from a base station as long as I zoom in to the aproximate area.

Often the updates are 40 or more minutes out of date, but even so this still seems pretty good.

I dont have confirmation its is them, it just tells me it is a pleasure boat, since I don't have the premium account for $20 per month. But if its going to work this well I might subscribe if they, or someone else I am watching heads offshore. It seems like a cheaper and easier way to get regular position updates than satcomms.

This satellite service seems like it could really justify having a AIS transmitter onboard even offshore in remote areas. I assume in the event of an emergency or search authorities could access this data?

Anyway the point of this post is a heads up if you didnt know about it, and also to find out more about how reliable it is if any of you have been using it, and if there is anyway to help improve your signal to get better sat coverage?
__________________

__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 27-06-2016, 23:06   #2
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,071
Re: Satelite AIS.

Here is a picture of the satelite tracking working.

Interesting that it seems to struggle to update in inshore waters. Maybe its because of the land around the vessel? Or maybe the update interval is worse than I thought?

Sent from my SM-G930F using Cruisers Sailing Forum mobile app
Attached Thumbnails
Click image for larger version

Name:	1467090248710.jpg
Views:	198
Size:	61.5 KB
ID:	127061  
__________________

__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 28-06-2016, 00:53   #3
Registered User

Join Date: Nov 2013
Location: Nice, France
Boat: Hunter Marine 38
Posts: 281
Re: Satelite AIS.

It would be easier if the boat just installed a Spot satellite tracking system. It will be cheaper to.


Envoyé de mon iPad à l'aide de Cruisers Sailing Forum
__________________
sailormed is offline   Reply With Quote
Old 28-06-2016, 01:26   #4
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,071
Re: Satelite AIS.

Not for a few one off voyages were it might be posible that $20 would cover it quite well. With this system, even the free limited version seems to work reasonably well. And has no extra cost, given they already have AIS onboard.

Sent from my SM-G930F using Cruisers Sailing Forum mobile app
__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 28-06-2016, 02:04   #5
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,071
Re: Satelite AIS.

Just looked up the latest spot plans, pretty neat option if you were away for a while. In aussie dollars its looking like around $200 for the spot, and $120 usd per year for a basic tracking plan. So long term its cheaper than a marine traffic type S-ais service, but short term its not.

It seems like some of the extra plans enable you to send text messages, it might be quite a bit cheaper than say the yellowbrick type? I couldnt find info on the number of msgs allowed.

Coverage doesn't seem to be worldwide. Big gaps in the pacific ocean by the looks of it.
__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 28-06-2016, 03:02   #6
Senior Cruiser
 
StuM's Avatar

Cruisers Forum Supporter

Join Date: Nov 2013
Location: Port Moresby,Papua New Guinea
Boat: FP Belize Maestro 43
Posts: 6,712
Re: Satelite AIS.

My preferred solution is a Delorme InReach. It cost me about $6 a month on standby and about $30 a month when I activate it for a trip. Better coverage that the spot and I can send and receive text messages if I need to.

Anyone can track me if I give them the Delorme mapping URL.
__________________
StuM is offline   Reply With Quote
Old 28-06-2016, 03:33   #7
Registered User
 
hoppy's Avatar

Join Date: Sep 2009
Location: Melbourne, Australia
Boat: Jeanneau Sun Odyssey 40
Posts: 2,842
Re: Satelite AIS.

Quote:
Originally Posted by sailormed View Post
It would be easier if the boat just installed a Spot satellite tracking system. It will be cheaper to.


Envoyé de mon iPad à l'aide de Cruisers Sailing Forum
Spot is rubbish for cruising.....

There is no speed data on the tracking site, it only shows a day or two tracking on the map and the coverage is not world wide.

Yellow brick is way better and I'm guessing so is the Delorme as both use iridium


Sent from my iPhone using Cruisers Sailing Forum
__________________
S/Y Jessabbé http://www.jessabbe.com/
hoppy is offline   Reply With Quote
Old 28-06-2016, 03:59   #8
Registered User

Join Date: Jan 2014
Location: New Jersey
Posts: 464
Re: Satelite AIS.

My Delorme InReach has worked flawlessly for the past 2 years in Europe as well as in US. Great piece of kit.
Tracks every 30 minutes, two way text, now with weather reports for an extra
1.00 US per report (data by OCENS). 25.00 US a year to keep it active
Then 35.00 per month when in use
Plus it's a back up GPS
Cheers
Neil
__________________
Time2Go is offline   Reply With Quote
Old 28-06-2016, 04:07   #9
Registered User
 
Snowpetrel's Avatar

Join Date: Jul 2012
Location: Hobart
Boat: Alloy Peterson 40
Posts: 3,071
Re: Satelite AIS.

I do like the Delorme. I think if I was headed offshore at the moment either that, or the YB would be high on my list. In aussie the plans are not as good as the US unlimited plan which seems like a bargain at usd $60 or $70 per month. The best aussie plan at the moment has only 200 free txts.

The base unit is good value but still costs aud$500 or so.

I guess both the spot, YB and Delorime also work in an abandonment situation and are stand alone, which is another plus.

Saying that the s-ais is virtually free if you already have AIS. And if you do just one offshore voyage or even just an isolated coastal voyage which is out of cell phone range it gives people a way to see where you are pretty cheaply.
__________________
My Ramblings
Snowpetrel is offline   Reply With Quote
Old 28-06-2016, 08:34   #10
Registered User
 
hoppy's Avatar

Join Date: Sep 2009
Location: Melbourne, Australia
Boat: Jeanneau Sun Odyssey 40
Posts: 2,842
Re: Satelite AIS.

Does S-AIS reliably work with lower powered class B units?


Sent from my iPhone using Cruisers Sailing Forum
__________________
S/Y Jessabbé http://www.jessabbe.com/
hoppy is offline   Reply With Quote
Old 28-06-2016, 09:26   #11
Registered User
 
El Pinguino's Avatar

Join Date: Aug 2013
Location: Punta Arenas ahorra
Boat: 39' Westerly Sealord
Posts: 3,949
Re: Satelite AIS.

According to this ( posted on another thread ) the answer is 'yes'.
http://www.sarsat.noaa.gov/BMW%20201...ng_21May10.pdf
El Pinguino is offline   Reply With Quote
Old 28-06-2016, 10:19   #12
Registered User
 
hoppy's Avatar

Join Date: Sep 2009
Location: Melbourne, Australia
Boat: Jeanneau Sun Odyssey 40
Posts: 2,842
Re: Satelite AIS.

Quote:
Originally Posted by El Pinguino View Post
According to this ( posted on another thread ) the answer is 'yes'.
http://www.sarsat.noaa.gov/BMW%20201...ng_21May10.pdf
Not necessarily....

There is a limitation with AIS of how many transmissions can be received and it's possible that given the vast areas that S-AIS satellites cover, they could need to filter out class B transmissions and only report class A and SART transmissions....

We need someone to stump up the cash to pay for access to S-AIS and track come cruisers and their class B units
__________________
S/Y Jessabbé http://www.jessabbe.com/
hoppy is offline   Reply With Quote
Old 28-06-2016, 10:47   #13
Registered User
 
hoppy's Avatar

Join Date: Sep 2009
Location: Melbourne, Australia
Boat: Jeanneau Sun Odyssey 40
Posts: 2,842
Re: Satelite AIS.

An example of why I don't think Spot is good for cruisers

Boaty's current atlantic crossing. The Spot page only shows 50 positions at a time, so you have to page through his track. Spot's information for each position report is only of limited use for people wanting to follow a journey


ESN :
0-2441613
Type :
TRACK
Latitude :
40.3165
Longitude :
-38.02884
Time :
28/06/2016, 10:53:16
Battery State :
GOOD

SPOT Shared Page


On the other hand, this is my pissing around in Greece YB track. It can show on a single page the whole journey. The date ranges visible are defined by the user. By defaut it is currently showing every position report since the start of 2015. Viewers can select the other date ranges I have defined (click on date, top left corner

This is the information reported each time.

25/Jul/2015 @ 03:30:00 EEST
38° 32.22N, 020° 13.19E / Course: 170° @ 3.9 knots
27°C

If I was to hardwire it to the boat, I can even transmit some NMEA data as well

https://my.yb.tl/Jessabbe/

I'm sure most sailors following family or friends from home will appreciate the additional information YB provides.
__________________
S/Y Jessabbé http://www.jessabbe.com/
hoppy is offline   Reply With Quote
Old 28-06-2016, 10:52   #14
Registered User
 
El Pinguino's Avatar

Join Date: Aug 2013
Location: Punta Arenas ahorra
Boat: 39' Westerly Sealord
Posts: 3,949
Re: Satelite AIS.

Quote:
Originally Posted by hoppy View Post
Not necessarily....

There is a limitation with AIS of how many transmissions can be received and it's possible that given the vast areas that S-AIS satellites cover, they could need to filter out class B transmissions and only report class A and SART transmissions....

We need someone to stump up the cash to pay for access to S-AIS and track come cruisers and their class B units
Hmmmm... well in that link they say than can monitor 1000's at a time and offshore yachts would be a small poprtion of the total
"Each satellites continually receives AIS signals from all ships in its footprint (1000‟s of ships !)"

Also Ben's parents only have Class B

And in conclusion.... go into MarineTraffic and filter out everything but 'pleasure craft'. This is what I just found for the central south pacific...NZ bottom left.
I'm sure they are not all super yachts with Class A.
Attached Thumbnails
Click image for larger version

Name:	Class B.jpg
Views:	147
Size:	208.0 KB
ID:	127080  
El Pinguino is offline   Reply With Quote
Old 28-06-2016, 11:07   #15
Registered User

Join Date: May 2011
Posts: 847
Re: Satelite AIS.

AIS has a major advantage over SPOT, Yellow Brick etc. in that it tells ships that are about to run you down that you are there, provided that they have AIS, and also alerts you to them, same proviso. And it gets picked up by the satellite AIS systems so you get two functions in one go.

I found that my class B AIS shows up fairly reliably in Polynesia on https://www.yit.nz/ when I looked at times when I had WIFI.

The satellite AIS trackers are becoming more reliable and more accessible as the technology matures.

For family and friends tracking I don't plan on doing any more than a daily (ish) update and only on ocean crossings to YOTREPS, occasionally I also fill in some postcard text too - also totally free.
__________________

__________________
Littlechay is offline   Reply With Quote
Reply

Tags
ais

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
AIS Simulation - Run VDR to play AIS Nmea file rgleason OpenCPN 16 12-01-2013 11:28
Satelite Telephone Iridium 9555: use as modem; slow download Pieter Marine Electronics 4 03-07-2012 05:19
Satelite Phone into Mobile Hotspot simonpickard Marine Electronics 2 07-09-2011 21:34
Can You Get Radar & AIS Overlay on Laptop ? AIS Transceiver Recommendations ? lunasea.ds Marine Electronics 22 27-12-2010 14:06
Satelite Mapping Utility Scott91963 OpenCPN 0 03-07-2010 19:12



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 16:36.


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.