[time-nuts] time-nuts Digest, Vol 95, Issue 33

[Mark Sims]

Is too true!   The GPS signal sends the week number as a 10 bit integer number.   That number rolls over every 1024 weeks (call it 20 years).   There is no data sent that indicates which 1024 week cycle it is (some have been proposed,  but I don't think anything was ever implemented).  Receiver manufacturers usually bias the received week number based upon  when the receiver was made.  That lets them ship receivers that are good for 20 years.   After that,  they may display a bad date.

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Not true.  GPS week is imbedded in the GPS data.