Abbreviations:

C       = degrees celsius
cm      = centimeter
dB      = decibels
dbar    = decibars
deg     = degrees
DO      = dissolved oxygen
E       = east
ft      = feet
GPS     = Global Positioning System (provides location information)
hPa     = hectopascal
infra   = infrared
L       = liter
m       = meters
mbar    = millibar
mg      = milligrams
mL      = milli-liter
mm      = millimeters
N       = north
No.     = number
NTU     = Nephelometric Turbidity Units
psia    = pounds per square inch absolute
rad     = radiation
RFU     = Relative Fluoresence Units
s       = seconds
S       = Siemens
sec     = seconds
ug      = micro-grams
uS      = micro-Siemens
UTC     = Coordinated Universal Time
W/(m^2) = watts per square meter
%       = percent
%sat    = percent saturation

Time format:
YYYY/MM/DD HH:MM:SS = Year/Month/Day Hour:Minute:Second

Direction convention:
  0 degrees = north, 90 degrees = east, etc.
  For wind data:
    0 degrees means wind coming from the north
  For water data:
    0 degrees means water moving to the north