Jo det kan bli olika resultat med olika appar beroende hur ofta den frågar hårdvaran och vilken intern algoritmen som används (hur man knyter ihop två punkter, med ett rakt streck eller en spline typ) men den stora felkällan tror jag är hur bra GPS kretsar du har...
http://www.topofusion.com/spline.php
En komplikation i det hela är om du tappar satelliterna så kommer telefonen att räkna position på triangulering av basstationerna vilket ger sämre noggranhet men det har jag troligen inte drappats av någon gång eller så filtrerar mjukvaran bort detta....
I Ipad 2 har man nu satt in en nyare krets Broadcom4751 vilket kanske antyder att 5:a också får en uppgradering
http://www.mobil.se/guider/under-skalet-pa-iphone-4-1.382419.html
http://www.broadcom.com/products/GPS/GPS-Silicon-Solutions/BCM4750
http://electronicdesign.com/article...dcom_gains_ground_in_the_gps_chip_market.aspx
"The Broadcom BCM4751 is a single-chip GPS receiver used for tracking and navigation, primarily in mobile devices. Its massively parallel, hardware correlator architecture provides fast signal searches, accurate real-time navigation, improved tracking sensitivity, and low average power consumption, the company said.
Enhanced tracking sensitivity allows GPS-enabled mobile devices to detect weak signals, including those partially blocked or reflected by buildings or other structures. With the higher sensitivity of the new BCM4751 GPS receiver, these initial location fixes occur much faster, and in many cases, will achieve a location fix when competitive products are unable to do so.
The BCM4751 also integrates external components that reduce the overall system cost for manufacturers and enables small footprints when designing GPS into mobile devices. With real estate in mobile devices at a premium, a complete GPS solution, featuring the BCM4751, will use less than 30 mm2 of board space, including all of the necessary components for a typical cellular phone implementation.
The BCM4751 supports additional satellite constellations including the Satellite Based Augmentation System (SBAS) and the Quasi-Zenith Satellite System (QZSS) for Japanese applications, making as many as 12 additional satellites available for use in navigation. This support for satellite constellations greatly aids urban canyon navigation, providing a straighter, more accurate navigation solution, as well as position fixes in more areas, when compared to competitive solutions, Broadcom said."
