He is not giving a lot of details on exact locations. But he does give precise mileages for a couple days. Using the THC data, I look for road crossings in about the right locations that are the designated distances apart. With this I speculate he was at County Rd 319 on 19. Hiking 35.2 miles on day 20 puts him at Camp Road (which was also posted above). He said he had a good day on Day 21 so let's assume he did 55.2 miles to Bake Oven Knob Rd. This works since the only two road crossings that are exactly 16.4 miles apart (the distance listed for day 22) in that area are Bake Oven Knob Rd and Hawk Mtn Rd (for day 22). Based on these assumptions he is after day 22 behind SJ by 32 miles and ahead of JPD by 1.4 miles.
day total miles location day miles 18 805.1 Arden Valley Rd 54.8 19 850.1 County Rd 319? 45.0 20 885.3 Camp Road? 35.2 21 940.5 Bake Oven Knob Rd? 55.2 22 956.9 Hawk Mtn Rd? 16.4
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