Why doesn't my AIS position update on marinetraffic.com?
- Thread starter jviss
- Start date
Small boats rely on an Internet connected AIS receiver/base stations which relay their position to the web based services. If you’re not near one, or its offline, you won’t show up. Large boats send theirs automatically via satellite.
That happens quite a bit, and it’s also possible that you moved out of range. It’s hard to know where the base stations are physically located.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,758
I found your Marine Traffic last posting.
Position Received: 2019-07-04 21:35 UTC
Vessel's Time Zone: UTC -5
Area: USEC - US East Coast
Latitude / Longitude: 41.19264° / -71.57563°
Status: Class B
Speed/Course: 0.1kn / -
Read more at http://www.marinetraffic.com/en/ais.../imo:0/vessel:SAGITTARIUS#Lmwrk8h7oZVAOl0s.99
AIS Source: 2328
To what Jackdaw was saying the AIS source identified is:
Dockside Electronics (Mystic) - Station #2328
Read more at http://www.marinetraffic.com/en/ais/details/stations#lw0DHG41mMryKz1Z.99
Tell me more about your AIS setup. How are you broadcasting? Are you anchored or moving? How have you configured your AIS to broadcast?
Position Received: 2019-07-04 21:35 UTC
Vessel's Time Zone: UTC -5
Area: USEC - US East Coast
Latitude / Longitude: 41.19264° / -71.57563°
Status: Class B
Speed/Course: 0.1kn / -
Read more at http://www.marinetraffic.com/en/ais.../imo:0/vessel:SAGITTARIUS#Lmwrk8h7oZVAOl0s.99
AIS Source: 2328
To what Jackdaw was saying the AIS source identified is:
Tell me more about your AIS setup. How are you broadcasting? Are you anchored or moving? How have you configured your AIS to broadcast?
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,758
Further examination using VesselFinder, I could not find your boat with a MMSI or Name search. I did sea a boat anchored in the "Great Salt Pond" with no name. It had a location identified by "Satellite AIS" a new app that has a 6 hour latency but helps to locate vessels when they are out of range from land based systems.
Thanks. yes, it's configured to broadcast, I've never changed that. It could just that I can't "see" Mystic from here. I'm anchored in Block Island, Great Salt Pond at 41º 11.5571' 71º 34.5279'. Last reported position was just about here, so at some point I was seen here.
Some where on the MarineTraffic.com website there is a coverage map. There are places with good coverage, so-so coverage and no coverage. My marina is in a no coverage zone so I can't be seen here. You may be in a no coverage zone.
Additionally AIS transmissions are prioritized, Class A transmissions get priority, Class B transmissions get sent when there is room on the time schedule.
Additionally AIS transmissions are prioritized, Class A transmissions get priority, Class B transmissions get sent when there is room on the time schedule.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,758
What type of system are you using for AIS transmission?
Normal AIS transmission for B class systems (like ours on pleasure boats) do not get recognized unless the boat is moving at at least 3 knots. Once the boat is moving the system identifies the boat as a possible target and starts to record the boat movement. Then the AIS system will identify the boat about every 6 minutes. Class A systems (commercial vessels) are mandatory identification every 30 seconds. Also fast movers are recognized at a higher frequency rate.
Sitting at anchor (unless your system is programmed to transmit frequently) the Class B system will not be identified until it again moves. If you happen to turn the AIS system off, or place it in "Silent" mode your location will be logged at the last received spot and eventually disappear from the map. With so many signals being tracked there has to be a way to be swept clean.
How did you register your AIS? You have an MMSI number 338206179. Is that a BoatUS provided number or a Federally issued number?
Normal AIS transmission for B class systems (like ours on pleasure boats) do not get recognized unless the boat is moving at at least 3 knots. Once the boat is moving the system identifies the boat as a possible target and starts to record the boat movement. Then the AIS system will identify the boat about every 6 minutes. Class A systems (commercial vessels) are mandatory identification every 30 seconds. Also fast movers are recognized at a higher frequency rate.
Sitting at anchor (unless your system is programmed to transmit frequently) the Class B system will not be identified until it again moves. If you happen to turn the AIS system off, or place it in "Silent" mode your location will be logged at the last received spot and eventually disappear from the map. With so many signals being tracked there has to be a way to be swept clean.
How did you register your AIS? You have an MMSI number 338206179. Is that a BoatUS provided number or a Federally issued number?
Unless you know better, I doubt "Satellite AIS" is an app. It’s more likely that the boat has an AIS system that updates via an on-board satellite data connection that I mention in my first post. The 6-latency is set to keep data costs reasonable.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,758
It is a subscription service through VesselFinder. https://www.vesselfinder.com/satellite-ais
Perhaps the term app was not used correctly. Rather expensive in my opinion, but useful for some folk.
It did identify jviss's boat as an AIS target but unless you subscribe to the service no boat data is provided.
Perhaps the term app was not used correctly. Rather expensive in my opinion, but useful for some folk.
It did identify jviss's boat as an AIS target but unless you subscribe to the service no boat data is provided.
Pretty certain it's a BoatUS issued number. It was acquired by the previous owner, and I was allowed to take it over.
You can also check VesselFinder and Fleetmon, which are similar to Marine Traffic. They each have better or worse coverage depending on the area.
Are you sure, or is there a setting for that? There are a few class B sailboats around our marina that I routinely see, even when they're docked for extended periods.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,758
I am unclear how the BoatUS folk disseminate the boat data to the AIS system. I found that once I had the data from the FCC and installed on my AIS transmitter the boat data was part of the AIS displayed information. I then went online with VesselFinder (because it was an easy app to use on my phone) and listed my boat the information into their data base.
@LeslieTroyer introduced me to MarineTraffic. I like the email messages when your boat enters of leaves a port and subsequently logged onto their system as well. When I enter or leave a port an email message gets sent to the address I have listed. This keeps my wife aware of my movement
while I am solo sailing. A pretty cool feature. At least they should be able to find the boat if I go missing or into hiding...
@LeslieTroyer introduced me to MarineTraffic. I like the email messages when your boat enters of leaves a port and subsequently logged onto their system as well. When I enter or leave a port an email message gets sent to the address I have listed. This keeps my wife aware of my movement
while I am solo sailing. A pretty cool feature. At least they should be able to find the boat if I go missing or into hiding...
From the Vesper FAQ:
Status on the unit is good, i.e., green LED on the unit, all O.K. on the app.
So, I should be sending position reports every 3 minutes, and vessel data every 6.
How often is my AIS information sent from a transponder?
The AISWatchMate 850, WatchMate Vision, XB-6000 and XB-8000 are Class B devices so it will send position reports every 30 seconds when you are moving faster than 2 knots, otherwise it drops back to every 3 minutes. Other information such as your vessel's name, size and type, is sent every 6 minutes.
The WatchMate will display a warning symbol if your transmissions are not being sent for any reason. The XB Transponders status LED will change color to orange. You can also query the reason for the status change using the vmAIS Configuration and Status Utility or WatchMate App over USB or WiFi.
The AISWatchMate 850, WatchMate Vision, XB-6000 and XB-8000 are Class B devices so it will send position reports every 30 seconds when you are moving faster than 2 knots, otherwise it drops back to every 3 minutes. Other information such as your vessel's name, size and type, is sent every 6 minutes.
The WatchMate will display a warning symbol if your transmissions are not being sent for any reason. The XB Transponders status LED will change color to orange. You can also query the reason for the status change using the vmAIS Configuration and Status Utility or WatchMate App over USB or WiFi.
Status on the unit is good, i.e., green LED on the unit, all O.K. on the app.
So, I should be sending position reports every 3 minutes, and vessel data every 6.
jssailem
SBO Weather and Forecasting Forum Jim & John
- Oct 22, 2014
- 22,758
Cool. Have the same unit. One of the features for the XB-8000 is the frequency of transmission.
The XB-8000 is a Class B devices so it will send position reports every 30 seconds when you are moving faster than 2 knots, otherwise it drops back to every 3 minutes. Other information such as your vessel's name, size and type, is sent every 6 minutes.
The WatchMate will display a warning symbol if your transmissions are not being sent for any reason. The XB Transponders status LED will change color to orange. You can also query the reason for the status change using the vmAIS Configuration and Status Utility or WatchMate App over USB or WiFi.
The WatchMate will display a warning symbol if your transmissions are not being sent for any reason. The XB Transponders status LED will change color to orange. You can also query the reason for the status change using the vmAIS Configuration and Status Utility or WatchMate App over USB or WiFi.
Looks like none of the Class B AIS targets on Great Salt Pond have been seen in quite a few hours. It's not just you. Its probably just that their receiver in the area is offline for now.
Its reception service. If you’re remote, you still need a method of getting your data up and into the cloud.