time     => '2017-05-16T22:29:29.000Z'   # date/time in UTC
lon      => '-114.000000000' # longitude
lat      => '51.000000'      # latitude
alt      => '1084.9'         # altitude (metres)
climb    => '0'              # rate of ascent/decent (metres/sec)
speed    => '0'              # rate of movement (metres/sec)
track    => '279.85'         # heading (degrees from true north)
device   => '/dev/ttyS0'     # GPS serial interface            
mode     => 3                # NMEA mode
epx      => '3.636'          # longitude error estimate (metres)
epy      => '4.676'          # latitude error estimate (metres)
epc      => '8.16'           # ascent/decent error estimate (meters)
ept      => '0.005'          # timestamp error (sec) 
epv      => '4.082'          # altitude error estimate (meters)
eps      => '9.35'           # speed error estimate (metres/sec)
class    => 'TPV'            # data type (fixed as TPV)
tag      => 'ZDA'            # identifier