MAG/NAV/M1 - Missing data

Data loss due to AMF2 data system computer and virtual machine problems.

Note that the data gap begins when ship was docked at Long Beach.  NAV data are not 
generally used when ship is at dock.  Ship left Long Beach on June 8, 2013 at 11:25.  So data 
gap while at sea is June 8, 2013 11:25 to 17:02 UTC.

Surrogate data sources may be possible depending upon actual requirements. Contact SEANAV 
mentor for discussion.

Contact SEANAV mentor

• Ship surge acceleration along ship length, positive forward(surge_acceleration)
• Yaw angular rate, clockwise bow rotation positive(yaw_angular_rate)
• Ship sway velocity, starboard-to-port displacement, positive to port(sway_velocity)
• base time in epoch(base_time)
• Heave directional velocity, up positive(heave_velocity)
• Ship sway, starboard-to-port displacement, positive to port(sway)
• Roll angle reported by tilt table, positive is port side up(roll)
• North Latitude(lat)
• Ship sway acceleration starboard-to-port, positive to port(sway_acceleration)
• Seanav monitor value as true/false conditions(seanav_monitor)
• Seanav system mode(seanav_mode)
• -180.0 - +180.0(alt)
• time_in_seconds_since_volume_start(time)
• Time offset from base_time(time_offset)
• Heave directional acceleration, up positive(heave_acceleration)
• Roll angular rate, positive is port side up(roll_angular_rate)
• Free running cycle counter(cycle_count)
• Ship yaw, axis vertical, positive is clockwise rotation(yaw)
• Ship surge velocity along ship length, positive forward(surge_velocity)
• Ship surge displacement along ship length, positive forward(surge)
• lon(lon)
• Pitch angular rate, bow up positive(pitch_angular_rate)
• Pitch, bow up positive(pitch)
• Heave: up positive(heave)