Wildlife Computers Mk9 Time-Depth Recorders (TDR-Mk9) are small archival tags best designed for studies involving marine animals where the tag and/or animal can be recovered.


Key advantages of the TDR-Mk9 include:

  • Small size—it is Wildlife Computers smallest data archiving tag and it can withstand 1000 meters of pressure. Additional configurations withstand up to 2000 meters.
  • Long life—efficient power management allows tags to function for multi-year deployments.
  • Cost-effective—TDR tags are a cost-effective option for studies where tags can be recovered.
  • User-programmable sampling protocols—users can specify which sensors to sample and at what interval.
  • Tag activation—the tag can be turned on and off with a magnet. The LED flash sequence indicates whether the tag is in standby mode or deployed.
  • Data decoding, analysis, and communication—Wildlife Computers provides easy-to-use software that allows the user to set up the tag for deployment, download the data after recovery, and aid in the analysis of the data.
  • Geolocation using light-level—Wildlife Computers GPE3 estimates daily longitude and latitude from recorded light-level curves.

Data Products

The TDR-Mk9 measures depth, temperature, and light-level and also differentiate wet or dry conditions at a user-configured sampling interval.

Light-level and a second temperature sensor can be added to a sensor stalk making it suitable for both external attachment and internal implantation. TDR-Mk9s have been used on seals, penguins, otters, large pelagic fish, and many other applications.

User Guide/Software

TDR-Mk9 User Guide
Detailed description of the features of the TDR-Mk9. Includes instructions on how to use the Mk9Host program to set up and deploy TDR-Mk9 tags.
64-bit USB Driver 18-Dec-2017
Driver for the Wildlife Computers USB-Blue communications cable. A 32-bit version is available on our Downloads page.
Mk9Host (Wildlife Computers Mk9 Host Program) Version: 1.09.1028 16-Apr-2010
Installs the Mk9Host program which is used to communicate with TDR-Mk9 tags. Mk9Host allows you to set up the tag’s deployment parameters. It also allows you to download archived data when the tag is recovered.
WC-DAP (Wildlife Computers Data Analysis Programs) Version: 3.0.369.0 05-Jan-2016
An integrated suite of programs to decode and visualize tag data downloaded from Argos and recovered tags. Also processes Fastloc® GPS and light-based geolocation data to calculate latitude and longitude estimates.
WC-GPE2 (Wildlife Computers Global Position Estimator) Version: 2.00.0027 11-Apr-2014
Produces light-based geolocation latitude and longitude estimates. Although this program is integrated with WC-DAP it must be installed separately.


Below are the general physical specifications of TDR-Mk9 tags.

Attachment TypeSurgically-implanted or externally mounted***
SensorsDepth, Temperature, Light-level, Wet/Dry***
Depth Sensor Range0-200 m, 0-1700 m, 0-2000 m***
Depth Sensor Resolution0.1 m, 0.5 m, 1 m***
Depth Sensor Accuracy± 1% of reading
Temperature Sensor Range-40 °C to 60 °C
Temperature Sensor Resolution0.05 °C
Temperature Sensor Accuracy± 0.1 °C
Light Sensor (when installed)5 x 10-12W cm-2 to 5 x 10-2W cm-2
Operating Temperature Rating (°C)-20 °C to 50 °C
Conductivity Operational Limits0.1 S m-1 to 5 S -1
Memory64 MB
Recommended Storage Temperature Range (°C)-20 °C to 5 °C
Length, Width, Height, Weight, Wet/Dry Sensor***
Maximum Deployment LengthOver eight years based on sampling depth, tag temperature, external temperature, and light every 30 seconds. Maximum deployment length is limited by memory thus depends upon the user-programmed sampling rates.

*** indicates the specification is dependent upon the configuration model

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