D2 
for these regressions ranged from 0.77 m/sec to 0.90 m/s. The greatest offset 
of -0.231 m/s was applied to channel 2741. New biases were computed from 
the changed offset using the following equation: 
bias... = bias,;, + (Aoffset / gain,....). (1) 
The open frame electromagnetic current meters posed a particular problem 
because of unanticipated biological fouling. Normally, the offset can be field 
determined by comparing data collected at orientations of 0 deg and 180 deg. 
However, the high wave activity during the last 2 weeks of the experiment 
prevented this check from being accomplished. An analysis performed on the 
current meter data from the crest and trough subarrays indicates an increase in 
the gains of the open frame sensors from the beginning to end of the 
experiment. This analysis is described in detail in the “Data Processing” 
section of Appendix E. 
Comparison calibration plots for the open frame current meters and the 
Marsh-McBirney sensors, where the post-calibration differed from the pre- 
calibration, are shown in Figures D2 through D33. 
Appendix D Current Meter Calibrations 
