Stage One — Water Tower
# = number of legs on the water tower
N 35° 24.A W 118° 58.B
A = #*# + 50*# + 384
B = 636 - #*# - 50*#
Stage Two — non-USGS BM
The BM has a stamp in the following form: RD PI M-D-Y
M = month
D = day
Y = year
N 35° 22.C W 119° 00.D
C = M*M + 3*D + 2*Y + 3
D = 78 + (M + D + Y)*7
Stage Three
Find the stamped four-digit number and the year on the benchmark.
# = stamp number
Y = year
N 35° 22.E W 119° 01.F
E = Y - # - 10
F = (sum of single digits in # and Y)*8 - 21
Example of summing the single digits: for the year 2016, the sum of the single digits is (2+0+1+6) = 9
Stage Four
Find the stamped two-digit number and the year on the benchmark.
# = stamp number
Y = year
N 35° 22.G W 119° 02.H
G = (Y - 22)/4 + 2*#
H = #*6 - 19
Stage Five
Find the stamped two-digit number and the year on the benchmark.
# = stamp number
Y = year
N 35° 22.J W 119° 02.K
J = #*6 + 19
K = Y - #*23 + 22
Final Stage
The final is not too far from the last BM and along a busy street. DO NOT stop on the street... please use a parking lot and walk the short distance to GZ.