While most users typically don’t base their smartphone purchases based GPS quality and accuracy, very few things get users in a bigger tizzy than when the GPS doesn’t work properly. Not being able to check-in to Foursquare or Facebook, Google Maps saying you’re going the wrong way, and inaccurate Google local searches will invariably result in user frustration.
On the Samsung Epic 4G, those aren’t the only issues you may encounter with the GPS. XDA Senior Member RyleyinSTL has pointed out that in areas and countries lacking CDMA coverage, the Epic 4G doesn’t even get GPS reception. Says RyleyinSTL:
I find the Epic GPS to work very well generally, especially in custom ROMs like CM7. That said it all falls apart whn trying to use the GPS in airplane mode or when overseas (or other areas with no CDMA cellular coverage). From what I can determine the Epic 4G was not configured properly to use the GPS chip in these circumstances.
So what’s the answer to this problem? Since we’re on XDA-Developers, the answer is to modify the GPS chip to work properly in those circumstances, and this is what RyleyinSTL has done.
The process to do so is pretty long and, according to RyleyinSTL, can be quite annoying because it involves many tools that users typically don’t use, such as the Qualcomm Product Support Tools. To put it broadly, users using these instructions and QPST can change the settings on the GPS chip, and have it lock even when not in a CDMA service area.
This modification is most useful for those who frequently travel overseas or places where their towers can’t reach. It should be noted, however, that this method can be particularly dangerous if done incorrectly. So be sure to proceed with extreme caution while using.
For the full method, all the download link, thread discussion and more, check out the original thread._________