Written by: James Burke
Sunday, August 17, 2008

Whilst out cycling yesterday I stopped to take a brief photo looking over towards Reeth in the Yorkshire Dales with an iPhone 3G:



After taking the photo I looked down to my cycling computer (Polar CS300) and noticed that the speed continued at a steady rate, and the trip distance slowly increased, whilst I was stationary taking a photo - as can be seen in the photos below.





During the hour prior to this I had been using the iPhone as an iPod and at three times (maybe coincidentally but seemed to happen on descents when speed reached above 30mph) the player stopped for around 2-3 minutes and then started again with no intervention.

During the cycle I was wearing a Polar wireless heart rate transmitter, and the cycle was fitted with both a wireless cadence and speed sensor that transmitted data to the cycling computer.

The iPhone of course has many wireless receivers/transmitters for 3G, GSM, GPS, BlueTooth and Wifi that provide the potential for radio frequency interference in a number of different ways.

Both devices undergo FCC testing and certification but