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From logbook entries of the sonic azimuths:

site

log date

pointing

sonic boom azimuth, magnetic

boom azimuth, true (mag+12.2)

Vazimuth, true (boom+90)

playa1

 

west

 

 

 

abc2

12/14

east

83.4

95.6

185.6

hiland2

12/14

east

249.5 - 180 = 69.5

81.7

171.7

wvally4

 

west

 

 

 

eslope5

 

east

 

 

 

wslope6

12/13

west

77.8 + 180 = 257.8

270

0.0

river7

12/13

west

85.5 + 180 = 265.5

277.7

7.7

Props

site

log date

pointing

prop azimuth, magnetic

prop az, true

notes

playa1

11/20

north

 

1.0

 

wslope6

11/20

north

 

1.7

should this have been -1.7, which agrees with 12/13?

wslope6

12/13

north

346.1

358.3