GPS

[Yorick Moko]

with cold start they mean no previous data: no information about
satellites, location or time

since the GPS chip itself does not have any memory, currently a power
off -> power on always results in a cold start (there is however some
work being done to overcome this, but I don't know if it is already
working)

On Mon, Jul 14, 2008 at 6:33 PM, C R McClenaghan <chris at mcclenaghan.com> wrote:
> What is meant by "cold start"? Is this simply a power off and power back on?
> Or is it the power cycle and no previous fix data for current location? With
> other GPS devices, until that first location fix was achieved, nothing
> happened, but once achieved and no significant change in geography, then a
> fix could be achieved in less than a few minutes. Given that most of these
> devices are being received in a location different than where ever the
> device may have previously gotten a fix, my thought is part of the problem
> is getting that first current location fix.
> Chris
>
> On Jul 14, 2008, at 9:23 AM, thomasg wrote:
>
> On Mon, Jul 14, 2008 at 2:12 PM, Ken Young <rtm at cfa.harvard.edu> wrote:
>>
>> thomasg wrote:
>>
>> > This all are no arguments.
>> > With my TomTom device I can do a full reset so that no GPS data is
>> > available
>> > at all (also no time and so on) and still get a fix in < 3 minutes at
>> > 100 km/h.
>> > Well, I know the freerunner is no specialized gps navigation device, but
>> > the
>> > fact that the signals are so weak that it's barely possible to get a fix
>> > under optimal condition (clear view to the sky, antenna on top, without
>> > moving 1 mm) shows, that this is no simple software problem and has to
>> > be fixed.
>>
>> The GPS performance of my Freerunner is also much worse than
>> the GPS performance of my neo1973.   I've done side-by-side tests of the
>> two units many times.   My neo1973 gets a good fix in 2 to 3 minutes
>> after a completely cold start; it's very reliable.   My Freerunner
>> initially was getting a fix after 7 or 8 minutes.   For the last few
>> days it has not been able to get a fix at all.
>>
>> Ken Young
>
> I can confirm that, too.
> The 1973 gets a cold start fix in less than 2 minutes.
>
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