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Spire’s AIS feed is not always real-time . The majority of messages are received particularly when collected by their satellite receivers. For their whole feed (including terrestrial data), 99% of data comes within minutes/under an hour, but some messages can be received hours later. 1 hour. However when we look at data from satellite receivers, a significant amount (>30%) is received more than 1 hour later.
Below is more detail provided by from Spire as of March 2024 . Below statistics use about messages picked up by their satellite receivers, using an arbitrary time interval (20-27 February, 2024) , and looking at latency between timestamp and our ingestion time.
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97.55% of all messages are ingested in 6 hours after AIS message is transmitted
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99.74% are transmitted within a day
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time
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.
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Median latency
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was 45 minutes & 95th percentile
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was under 4 hours.
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