MAG/NAV/M1 - Missing data

The Hydrins III rental system hung.  Problem was not corrected until ship was in port 
allowing for mentor access.

Depending on the specific need surrogate data might be constructed from other sources.

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)