[HTC One X] dezborders:
Couple of observations....

There was no need to do a clean install of your Rom. By the sound of it you didn't try superwipe on your existing rom followed by Nandroid restore like I suggested? That's a pity as I want to see if superwipe does have any effect with someone else testing my process so others could avoid having to do a clean install of everything.

I had a look into this in more detail..

Nandroid backups includes... .android_secure, boot.img, cache, data, recovery & system.

Superwipe does the following:-

run_program("/sbin/erase_image", "cache");

format("ext4", "EMMC", "/dev/block/mmcblk0p13");

run_program("/sbin/erase_image", "system");

format("ext4", "EMMC", "/dev/block/mmcblk0p12");

run_program("/sbin/erase_image", "userdata");

format("ext4", "EMMC", "/dev/block/mmcblk0p15");

ui_print("4. Removing system files from SD Card");

delete_recursive("/sdcard/.android_secure");

delete_recursive("/sdcard/.bookmark_thumb1");

delete_recursive("/sdcard/.data/footprints");

delete_recursive("/sdcard/.data/mail");

delete_recursive("/sdcard/Android/data/com.android.providers.media");

delete_recursive("/sdcard/Android/data/com.dropbox.android");

delete_recursive("/sdcard/Android/data/com.google.android.apps.books");

delete_recursive("/sdcard/Android/data/com.google.android.apps.genie.geniewidget.news-content-cache");

delete_recursive("/sdcard/Android/data/com.google.android.videos");

delete_recursive("/sdcard/Android/data/com.google.android.apps.maps");

delete_recursive("/sdcard/Android/data/com.google.android.youtube");

delete_recursive("/sdcard/Android/data/com.htc.album");

delete_recursive("/sdcard/Android/data/com.htc.cloudstorage");

delete_recursive("/sdcard/.data/navigator/Data/Temporary");

delete_recursive("/sdcard/LOST.DIR");

I believe it is the folders on the SDCARD partition that superwipe cleans up and that CWM recovery doesn't wipe when changing roms.

You say there's one set of point in your tracks data that's way off. 1 set Out of how many sets though? The big deal here is that the vast majority of your walk round the block looks ok on the graph. I am not 100% sure even a non faulty HOX GPS would guarantee that every single sample would be perfect. As to unreliable locations early on in your test, this is to be expected without agps don't you think? Hopefully sat nav apps will be useable for you with this workaround now?

Once gain nobody claims this is a fix for the GPS hardware fault, it's only a workaround.

Send your hox in for repair if it's not acceptable long term to you. That's your right after all.

In my situation i would rather use this workaround for the time being than be without my hox for a month and risk the repaired / replaced unit having same issue or wi fi antenna issue as well. I have a 2 year warranty through my UK network provider and will eventually get round to sending it in for repair but I just don't trust the guys at HTC have a good handle on exactly what's wrong. I think they might just factory reset my HOX, RUU in the latest branded FW for my network and ship it back to me unrepaired. Hopefully in 3-6 months this will change.

Thanks for all the useful feedback m8 and hope you finally get some use out of your GPS, whether you use this workaround or whether you send in for repair. ;)

Glad you finally have some level of improved stability in your GPS signal and sorry its still not good enough for your own personal situation. :)