Scientific Sampling Event Log

The R2R Eventlogger is a program that creates a record of the scientific sampling events conducted during a cruise. It uses the Electronic Logbook (ELOG) program ( by Stefan Ritt. The underlying concept is that each deployment of a sampling device (e.g. CTD, MocNESS, gravity core) gets logged in a digital file with sufficient information to uniquely and accurately describe the event.

Events can be edited, duplicated, or entered at a later time than they occured. A snapshot of date/time/gps position is kept during the cruise and is employed to determine the ship's location at the time the event occured.

Each entry in the scientific sampling event log includes date and time (UTC), position (latitude and longitude), fields for station and cast identifier, sampling instrument name (e.g. CTD, MOC10), the action being performed, the name of person responsible for the sampling event, and a comment field to record additional information. The minimum requirements to document a sampling event are the instrument, the action (deploy,recover,etc.) and the author of the event.

Each sampling event is identified with a unique sample event number. When combined with the cruise identifier, this event number is unique across the US academic fleet.

The objective of maintaining a sampling event log is to create an accurate record of all sampling events from a research cruise. Some best practice guidelines to ensure an accurate and complete Eventlog include:

  • The event log should be started when the ship leaves port, and concluded upon arrival.
  • Whenever possible ‘controlled’ vocabulary terms should be used for instrument names.
  • A free text field is used to capture comments and anecdotal information for a sampling event.
  • Date and time are recorded in UTC.
  • Accurate position (latitude and longitude) data is recorded for each event, but periodic spot checks with ship’s GPS should be done to ensure any time/position related problems are caught quickly.
  • Contents of the event log should be reviewed regularly during a cruise to ensure completeness and accuracy.

The final event log is a plain text csv file, which can be included in the Cruise Data Distribution.
Complete a request form if you would like to use the R2R EventLogger during an upcoming cruise. Set up can be done before arrival at the ship, or on board. If you have any questions regarding use of the R2R Eventlogger send email to See the following link for more documentation