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{
    "url": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/PCNE3SKKQUICFYQIET3TUJUWAKXWGJNR/?format=api",
    "mailinglist": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/?format=api",
    "message_id": "ACD0A4C5975044CC9BFFD86A806249F4@satellite",
    "message_id_hash": "PCNE3SKKQUICFYQIET3TUJUWAKXWGJNR",
    "thread": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/thread/HM6I7EWKNIL2APQME4RBCJGD3HMSHC2Y/?format=api",
    "sender": {
        "address": "alancresswell (a) xtra.co.nz",
        "mailman_id": "0292a8a18be44d6a9fd4a622af40d892",
        "emails": "https://mailman.amsat.org/hyperkitty/api/sender/0292a8a18be44d6a9fd4a622af40d892/emails/?format=api"
    },
    "sender_name": "Alan Cresswell",
    "subject": "[amsat-bb] Re: GPS Time observation",
    "date": "2012-02-02T20:12:03Z",
    "parent": "https://mailman.amsat.org/hyperkitty/api/list/[email protected]/email/ODSHR5FAQJDKKMC5GVBQTUAKR62NWLMY/?format=api",
    "children": [],
    "votes": {
        "likes": 0,
        "dislikes": 0,
        "status": "neutral"
    },
    "content": "Well the most likely explanation would seem to be related to your GPS\ndisplay routine.  If you are getting accurate position information the\ntiming from the satellites must be within a few nanoseconds.  The satellite\ntime currently differs from UTC by plus 15 seconds because UTC is retarded\nby one leap second on a regular basis but the satellite time is not altered.\nThe satellites broadcast this offset from UTC but only every 12.5 minutes.\nIt is not unusual for a GPS display to have a relatively low priority\ncompared to the intensive position calculations and give a time display that\ndiffers by a second or two from UTC.\n\n73\nAlan\nZL2BX\n\n\n\n-----Original Message-----\nFrom: [email protected] [mailto:[email protected]] On\nBehalf Of Dave Guimont\nSent: Thursday, 2 February 2012 18:29\nTo: Vince Fiscus, KB7ADL\nCc: [email protected]\nSubject: [amsat-bb] Re: GPS Time observation\n\nInteresting question, Vince...am sure someone on here will be able to \nanswer it. I know at one time the civilian population was restricted \nfrom the most accurate location, and as I also remember the military \naccuracy was within a centimeter if several observations were \ntaken...Nice to see your smiling face on here, my friend...\n\nAnyone?\n\n73 Dave\n\n>I have an old GPS unit, a Magellan explorist 210. It's fairly \n>accurate determining position. After it has acquired about eight to \n>ten satellites the position error averages between 20 to 35 \n>feet.  Now the question, the other day I was looking at one of the \n>information pages the unit can display and on it, it gives the time \n>in UTC. Just for fun I thought I would see how close the time was to \n>WWV. I was surprised to see the unit was between one to four seconds \n>off over various tests compared to WWV. IS this typical of all GPS \n>units or do some display the time of day more accurately?\n>\n>KB7ADL\n>\n>_______________________________________________\n>Sent via [email protected]. Opinions expressed are those of the author.\n>Not an AMSAT-NA member? Join now to support the amateur satellite program!\n>Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n\n\n            73, Dave, WB6LLO\n                [email protected]\n\n                    Disagree: I learn....\n\n               Pulling for P3E... \n_______________________________________________\nSent via [email protected]. Opinions expressed are those of the author.\nNot an AMSAT-NA member? Join now to support the amateur satellite program!\nSubscription settings: http://amsat.org/mailman/listinfo/amsat-bb\n\n",
    "attachments": []
}