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<div class="moz-cite-prefix">Hi Arthur,<br>
I don't know much about this myself but I do know my TomTom satnav
(not GPRS enabled) requires a regular QuickGPSFix update
downloaded to keep it up to date with expected satellites.
SatNav's without that update have to rely on historical
information about the satellites instead.<br>
<br>
Regards,<br>
Christopher Cook<br>
<br>
On 05/11/2014 00:42, Arthur Hebert wrote:<br>
</div>
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cite="mid:CAJVL8xikKED_HNRsyaZyLq3Eq_UhYza-oB7a1-ZGBZX39C_0Gw@mail.gmail.com"
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<div dir="ltr">Hi All,
<div><br>
</div>
<div>Does anyone know the details of how, most reliably and most
quickly, to get a location fix from the GPS module after it
has been powered up and after it has come out of sleep mode?</div>
<div><br>
</div>
<div>I have written my own code using the OVMS hardware. To save
power, it turns off the GPS power (AT+CGPSPWR=0) and puts the
module to sleep (AT+CSCLK=2) while the vehicle is parked (i.e.
no CAN bus activity). Once there is CAN activity again, it
comes out of sleep mode (AT+CSCLK=0) and turns on the GPS
(AT+CGSPPWR=1). Immediately after turning on the GPS power, I
also issue one of the GPS reset commands (AT+CGPSRS=0 or
AT+CGPSRST=1).</div>
<div><br>
</div>
<div>The module documentation if vague about when to use the 0
reset or the 1 reset.</div>
<div><br>
</div>
<div>I know that the GPS module itself isn't made to function
while the module is asleep even though the commands may not
give an error. </div>
<div><br>
</div>
<div>I've read that it takes up to 15 minutes to get a fix on
most GPS devices. In practice, sometimes I get a fix within a
minute every time I start up, and other times I don't get a
fix even after hours of trying with either reset option. </div>
<div><br>
</div>
<div>Any information will be greatly appreciated.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Arthur</div>
</div>
<br>
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