You will, of course, start at a phone booth and you may need tools to get the number. Let the last seven digits be ABC-DEFG.
I've been told there's a new phone at the posted coords as of 01/20/2020,
Using this number, park at N45 E(F-G).(E-D)(D+E)(F-G) W123 D(F-G).(D+E)(C-D)(F+G) and proceed up the trail to the final cache at N45 C(F*G).(F*G)BC W123 D(C-D).B(C-D)(F*G).
Checksum for parking = 48
Checksum for final = 69
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Replaced cache formula as of 06/28/2018
Using this number, park at N45 EF.(A-B)DF W123 GF.D(B-C)A and proceed up the trail to the final cache at N45 B(A+G).(A+G)(B+C)B W123 C(E-B).(B+C)(B-C)(A+G).
Checksum for parking = 48
Checksum for final = 69
Old cache formula before 06/28/2018
Using this number, park at N45 EF.(A-B)DF W123 GF.D(B-C)A and proceed up the trail to the final cache at N45 B(A+G).(A+G)(B+C)G W123 C(E-B).(B+C)(B-C)(D-A).
Checksum for parking = 48
Checksum for final = 61
Offset for old formula N +.001 W +.007