out of date info

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    Thalia Tsarli

    Dear Thomas,
    Thank you for contacting us.
    As a basic user you have access to positions recorded by our network of terrestrial stations for free. We are glad to say that we have the largest network of it's kind in the world!
    When you do not see updated positions and get the message "out of range", then the vessel is far away from terrestrial stations and can only be tracked via satellite. This is only available to subscribers of our satellite plans or Sat Add-ons.
    Could you please be kind enough to provide specific examples of vessels with no updated positions?
    Let me know if you detect such vessels in a specific area so as for me to check the coverage of the respective area.
    Looking forward to hearing from you.
    Best regards,

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    John Gallon

    Further to Thalia's answer, our local RNLI lifeboat was out on exercises this morning and has been back in the boathouse with all electrical systems powered down since lunchtime. It is still showing as Rnli lifeboat D-703 at N55.47 W-01.57. The pop-up when the cursor is hovered over the vessel icon is alternating between position received 6hrs 59min ago and position received 7hrs 0min ago. The time since position received is not incrementing when the display refreshes.

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    John Gallon

    Forgot to add that other vessels going through the area are being reported correctly.

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    Thalia Tsarli

    Hello John,
    As far as I can see the latest position received for this vessel was on 2016-11-27 10:52 UTC via terrestrial means.
    On that date you have received 4 positions for this vessel:
    http://www.marinetraffic.com/en/ais/index/positions/all/shipid:200122/mmsi:235096949
    Let us know if the AIS transponder is currently switched on.
    I look forward to hearing from you.
    Best regards,

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    John Gallon

    I've haven't been over to the Lifeboat Station to check, but the standard procedure is that the boat is fully powered down and the battery put on charge when it is taken back into the boathouse. The AIS transponder should have been switched off since lunchtime yesterday.

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    Thalia Tsarli

    Thank you for the update.
    Since the AIS transponder is switched off, we cannot obtain updated positions.
    Once it is turned on again, the record will be updated in our database.
    Best regards,

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    John Gallon

    Thalia

    I don't think the current position of a vessel is the issue. I think what interests Thomas MacKenzie and myself is why the chart continues to show a vessel in a position from which it last reported many hours ago. For example, our lifeboat was still shown on the chart at about 09:00 GMT today which is 22 hours after you last received its position. After what length of time without a report does Marine Traffic remove a vessel from the chart.

    This can actually have a safety implication as we often see fishing boats on the chart off our coast with positions last reported many hours ago. We have no way of knowing whether the boat has moved away or has actually got into trouble.

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    Thalia Tsarli

    If there is no updated position, the latest one is displayed on the Live Map for 24 hours.
    If, in the mean time, an newer position is received, it replaces the old one.
    I remain at your disposal for any further clarifications you may need.
    Best regards,

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    John Gallon

    Thalia

    You say in your last post that the last reported position of the vessel stays on the map for 24 hours. Our inshore lifeboat was last out on exercise on Saturday 31/12/16 and has been in the lifeboat house and powered down since about lunchtime on that day. However, it is still showing on the map and when I hover the cursor over the vessel it reports the position as received 3 days and 20 hours ago. When will the outdated position be removed from the map, please?

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