I uploaded a GPX trace from here in order to get a well aligned map as the alignment of the NEC and the train station is different from the alignment of most of the rest of the area. However, I didn't get a GPX trace good enough to perform alignment on, as there is no clear "offset" of it. I cycled around a loop 10-20 times, but there still isn't a good enough trace. What methods should I try to get a Bing offset within <1m so that I may correctly re-align the train station and/or the surrounding town?