--yearbase 2018  ## required, for decimal day conversion (year of first data)
 --cruisename SH1800  ## *must* match prefix in config dir
 --dbname aship  ## database name; in adcpdb.  eg. a0918
 --datatype uhdas  ## datafile type
 --sonar os75nb  ## specify instrument letters, frequency,
                ##     (and ping type for ocean surveyors)
 --ens_len 300  ## averages of 300sec duration
 --configtype  python  ## file used in config/ dirctory is python
 --max_search_depth 2000  ## try to identify the bottom and eliminate
                           ##    data below the bottom IF topo says
                           ##    the bottom is shallower than 1000m
 --xducer_dx 0  ## positive starboard distance from GPS to ADCP
 --xducer_dy 0  ## positive forward distance from GPS to ADCP
 --update_gbin  ## always update the gbin

 --ping_headcorr  ## ps0918_proc.py says use HDT first, correct to ashtech