GPS SAMPLING RATE

tombartley · Post by **tombartley** » Fri Apr 13, 2012 4:59 am

Does anyone know at what rate does the GPS sample with standard IPhone as used in Harry's Laptimer ???

I am tossing up buying an IPhone / Harry's Laptimer Pro or purchasing a Race Technology (UK) DL1 data logger
which will sample at 20htz.

It will be used for race track events where the sample rate is reasonably critical.

As I am not "the sharpest knife in the draw" on this subject, answers in Htz. would be best understood by me.

Cheers,
Tom.

bulls23 · Post by **bulls23** » Fri Apr 13, 2012 8:16 am

The internal Sensor of the iPhone logs at 1Hz. You can connect external gps devices which will support up to 5Hz at the moment:

http://www.gps-laptimer.de/Compatibility.html

tombartley · Post by **tombartley** » Thu Jan 23, 2014 6:36 am

bulls23 wrote:The internal Sensor of the iPhone logs at 1Hz. You can connect external gps devices which will support up to 5Hz at the moment:

http://www.gps-laptimer.de/Compatibility.html

Thanks for the reply.....even though it was quite a while back...I eventually inherited my son's iPhone 4S
and downloaded HLT.....very impressed.....Finished one track day (25 laps) at Winton in Victoria, Australia.

Started looking at the data on the iPhone and then exported some ( no Video) to my Mac....however, after getting some data across ( lap times / splits ect ), I then sent some via Google Maps...it made it Ok, but on going back to HLT (" Lap List" ) everything had disappeared...no history at all...!!!

As you were kind enough to reply last time, in desperation I decided to ask you another question...can I retrieve the data on my iPhone / HLT, or has it gone to God..??

Cheers,
Tom.

Post by **Harry** » Thu Jan 23, 2014 8:31 am

Do you have a filter set in Lap List? Check the top left for a red Filter button. Red means "set" potentially reducing the laps shown.

Harry

gplracerx · Post by **gplracerx** » Thu Jan 23, 2014 7:04 pm

bulls23 wrote:The internal Sensor of the iPhone logs at 1Hz. You can connect external gps devices which will support up to 5Hz at the moment:

http://www.gps-laptimer.de/Compatibility.html

Actually, that's 20Hz with the VBOX Sport and 10Hz with the Dual XGPS160 (best value, IMO), both over Bluetooth. The Emprum Ultimate at 5Hz plugs into the auxiliary port. It's designed for the old 30 pin port, I don't know how well it works with a lightning to 30 pin adapter for the iPhone 5. The important point being whether the iPhone 5 will charge through the adapter with the Emprum plugged into a USB charger.

tombartley · Post by **tombartley** » Mon Jan 27, 2014 8:16 am

Harry wrote:Do you have a filter set in Lap List? Check the top left for a red Filter button. Red means "set" potentially reducing the laps shown.

Harry

Thanks for the reply Harry,

I've gone to the "Lap List" window...Filter / Lap /Trackday/ Session/Year ( where my 25 laps at Winton Raceway used to reside)

The "Filter" was not highlighted in RED

Seems as if in transferring my data to the laptop, I have somehow managed to deleted it.

I'll keep at though.

Thanks,
Tom.