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CastAway™ CTD

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Handheld Deployable CTD with Integrated GPS and LCD Display

The YSI CastAway™ CTD is the world’s first handheld castable instrument that provides instantaneous profiles of temperature, salinity, and sound speed.  Oceanographers, hydrologists, and surveyors now have the ability to quickly collect reliable data from any dock, bridge, or boat. Download the White Paper.

This product is RoHS Compliant
YSI CastAway CTD, front and back views with skin.
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YSI has Authorized Distributors all over the globe. View a map and find your closest contact for YSI CastAway™ CTD products and accessories.

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Have a question about your YSI CastAway™ CTD? Check out the support page with resources compiled just for you.

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Want to return a product for service? Here you'll find authorized service centers and instructions on how to send in your YSI CastAway™ CTD.

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View the archived training seminar: Profiling and Analysis with the CastAway CTD

CastAway DeploymentField Ready and Rugged

The CastAway CTD* is a hand deployable conductivity, temperature, and depth instrument for hydrologic profiling.  An integrated LCD screen displays an intuitive user interface for deployment and immediate review of collected data including both statistics and profile plots. The watertight, compact design features a tough rubber jacket for additional durability in harsh conditions.  The system utilizes BlueTooth wireless communication, so no field cables or connectors are needed.  Two AA batteries power the CTD for several days at a time and are easily replaceable without the use of any tools.  This handheld device is an affordable, rugged, and portable instrument that simplifies any water profiling application.


With three taps of a magnetic stylus pen, simply drop the CastAway in the water, pull it up, and have conductivity, temperature, and depth measured in minutes. An attractive LCD screen provides easy access for setup, deployment, and immediate data review.  Integrated GPS virtually eliminates the need for field notes.  The beginning and end of every cast is logged to the internal recorder with position and time.

CTD Profiling and Analysis Software

Reviewing and analyzing CTD profiling data has never been easier. The included GIS software quickly downloads data from each of your CastAway CTD’s automatically over BlueTooth to show the location of each cast on an interactive map. Customize your CTD data, GPS information, and plot comparisons all in one place.  Analysis, plotting, editing, and exporting of data are quick and easy tasks.


  • GPS position, date, and time
  • Fast sampling and sensor response
  • Waterproof interface works in and out of the water
  • Bluetooth wireless communication
  • No user calibration needed
  • No tools, computers, or cables required

Key Applications

Best used in:

  • Coastal Oceanography
  • Hydrology
  • Surveying/Hydrography
  • Aquaculture/Fisheries

When needed for:

  • Saltwater Intrusion
  • Sound Velocity Profiles
  • Field Sensor Verification
  • Coastal Research

*Patents Pending.

Schedule your free demonstration today.




Range Resolution Accuracy
Conductivity 0 – 100,000 µS/cm 1 µS/cm 0.25% ±5 µS/cm
GPS 10m
Pressure 0 – 100 dBar 0.01 dBar 0.25% of FS
Salinity (Derived) Up to 42 (PSS-78) 0.01 (PSS-78) 0.1 (PSS-78)
Sound Speed (Derived) 1400 –1730 m/s 0.01 m/s 0.15 m/s
Temperature -5 to +45°C 0.01°C 0.05°C



Communications Internal BlueTooth Radio (Class 2);
Up to 10m range
Dimensions Diameter
2.8 in, 7.11 cm
8.0 in, 20.32 cm
1.0 lbs, 0.45 kg
GPS 10m accuracy; Acquisition time 1 min. from cold start
Power 2 Standard AA batteries for 40+ hours of operation
Recorder 15 MB recorder;
Good for 750+ casts during typical use
Sample Rate 5Hz






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