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  1. #1
    Member +
    Join Date
    Jan 2011
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    Default Transatlantic flights with Nuvi

    I'm taking my Nuvi to the US this summer. I have done the US with my previous Garmin, but it took at least 15 minutes to decide we weren't in London anymore. On that occasion it didn't matter, as I was sat outside our hotel in Washington DC waiting for it to recalibrate it's location. On this occasion, we are flying into Las Vegas and collecting a car at the airport.

    I know there may be no way to speed up the time it takes to recalibrate, but I was wondering if there is any way to tell it where it is to speed up the process? I will probably shove one of the kids outside with it to bake in the hot sun whilst we check in, but it would be good if anyone has any tips here.

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  3. #2
    catymag's Avatar
    Join Date
    Nov 2007
    light side
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    Default Cold Start, Warm Start and Hot Start

    This is called Cold start - if the GPS not been used for a long time and/or has moved several hundred kilometres it will take some time to get the first fix.
    In this state, the GPS receiver does not have a current almanac, ephemeris, and initial position.To determine the location of the GPS satellites two types of data are required by the GPS receiver: the almanac and the ephemeris. This data is continuously transmitted by the GPS satellites and your GPS receiver collects and stores this data.

    To get a fix, your GPS receiver requires additional data for each satellite, called the ephemeris. This data gives very precise information about the orbit of each satellite. Your GPS receiver can use the ephemeris data to calculate the location of a satellite to with a metre or two. The ephemeris is updated every 2 hours and is usually valid for 4 hours.
    Even if your GPS receiver has been off for a while, it may take up to several minutes to receive the ephemeris data from each satellite, before it can get a fix.

    When Nuvi must recreate its almanac, it needs probably around one minute per satellite. So to get a new position it will need at least 4 minutes and to get a precise one probably around 15 minutes.

    "Cold/warm/hot start" indicate how many pieces of data the GPS receiver already has.

    Warm start - current almanac, initial position, and time are all valid. Ephemeris data is either invalid or only partially valid. Time-to-first-fix is likely to be 30 seconds to 2 minutes depending on satellite availability and the type of GPS receiver.

    Hot start - if the receiver has been off for, say, less than an hour time-to-first-fix will likely be 5-20 seconds.
    You have to navigate to get to the good.

    [Only registered and activated users can see links. ] Password for my files: gpspower.net
    Please don't flood my pm box with questions you can post on forum!! You won't hear back from me.
    Galaxy S5 Kitkat 4.4.2 / Nuvi1200->1250 / Nuvi3790T->34xx / Nuvi 2200 / Nuvi 66 / Oregon 600

  4. #3
    GPSPower Helper

    dasilvarsa's Avatar
    Join Date
    Feb 2011
    Rep Power


    Switch on Nuvi and acquire satellites before leaving home.(Switch off)
    Switch on and Set simulation mode at the arrival airport.
    Set location to arrival location and then exit simulation mode,do not switch off nuvi.
    This reduces the time to acquire satellites somewhat.
    The difference between stupidity and genius is that genius has its limits.
    Albert Einstein.




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