Ok guys [& gal], he's the results. I've simply attached the track logs & screenshots rather than post them for obvious reasons. Sorry, but i didn't think to do screenshots until almost 18 mins into the test. Total time is nearly 40 minutes to there's a lot to compare on the logs in 1 sec increments. I sat for about a min or so to give the units time to properly lock. Prior to the test all units had nv cleared and are using the same map.

As i said, i'm a bit of a noob using track logs and making deductions from them, but it seems to me that they prove the lack of accuracy in the 2 converted units when compared to the 3590 and unconverted 3790 (Nos. 1 & 4 respectively). That is, the 3590 & 3790 appear to agree more than disagree. No 2 is the 3490 newly-converted flashed with kunix's rgn and No 3 is the 3490 convert which has been flashed back and forth 37>34 numerous times. The vertical accuracy in the converts is crazy-inaccurate. Even the 3590 & 3790 don't agree totally there, but they i think are within acceptable limits for automotive units (although i wouldn't want to be doing a precision instrument landing approach using any car gps, lol!)

3590 & 3790 showed mostly 3 m accuracy as expected, occasionally with one displaying 4 m for a mere couple of seconds or so [but never both together]. I still don't believe those constant 3 m accuracy reports. Hotfix 'mirrors & cigar smoke imo. Both converts averaged around 8 m mostly i suppose, but there was disparity between them at times, with them alternating showing the more accurate reading.

Conditions were semi-overcast. Except for the last straght run along a main road, I kept to a well-treed suburban area with lots of curvy streets and cul de sacs, so direction was changing often. Very tall trees in places. Before the straight run at the end, I took the car into a shopping centre underground car park and was amused to see 3 m still reported with no sats visible.

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