On-boat performance sensor

Every stroke, captured at 100 Hz

Kosoku sits on the deck and records how your boat really moves: speed, stroke rate, distance per stroke, roll, pitch and heave, from the first stroke to the finish line.

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Kosoku sensor on a pontoon in front of a regatta course
100 Hz
GNSS and motion data, fused
10 Hz
Dual-band GNSS positioning
0.1°
Stated pitch and roll accuracy
5 h
Training battery life
Kosoku mounted on the deck of a K1 kayak
Kayak
Kosoku on the deck of a rowing boat on the water
Rowing
Fits every hull

Stick it on. Paddle. That's the setup.

Canoe, kayak, rowing from the single to the eight, dragon boat or SUP: Kosoku goes on the deck and gets out of the way. Athletes never have to touch a button.

  1. MountFix it to the deck and you are done. Plug and play: no buttons, no setup.
  2. PaddleAutomatic activity detection records every set for you. Just start paddling.
  3. SyncBack on the dock, sessions travel over WiFi to Quko Cloud. No cables, no card readers.
One sensor, the whole picture

What Kosoku records in every session

Motion sensors and dual-band GNSS fused at 100 Hz, plus everything you connect to it, on one synchronised timeline.

Kosoku held in one hand in front of a lake

  • Speed and position

    Dual-band GNSS at 10 Hz, fused with the motion sensors for smooth, reliable speed.

  • Every single stroke

    Rate, distance per stroke, duration, peak acceleration and deceleration.

  • Boat motion

    Roll, pitch, yaw and vertical movement show how steadily the hull runs.

  • On your wrist

    Live data on a Garmin watch data field, so athletes see it while they paddle.

  • Heart rate

    Up to four heart-rate belts on the same timeline as the boat.

Three-quarter render of the Kosoku sensor
Under the shell

Technical specifications

Primary data
100 Hz
Positioning
10 Hz, dual-band
Stated accuracy
Pitch and roll: 0.1°Yaw: 0.5°Heave: 1 cmPosition: 50 cmOn a calibrated boat
Enclosure
IP67, wireless charging
Weight
130 g
Battery
5 h of training
Data
Encrypted on-device storage, WiFi upload
Accessories
Heart-rate belts, rudder sensor and anemometer
Live
Streams to Quko Live and to a Garmin watch data field
Updates
Firmware over the air
Kosoku next to its retail box and wireless charging base
Ownership made easy

Out of the box and backed for years

Kosoku arrives with its wireless charging base. Pair it from your phone over Bluetooth and it’s ready for the water.

  • 2-year warranty included with every Kosoku.
  • Responsive customer support, reachable on WhatsApp.
  • Automatic updates: firmware and app improvements arrive over the air, with nothing for you to install.
Better together

Kosoku is where the data starts

Quko Live running on a tablet in a coaching boat During the session Quko Live Stream every Kosoku to the coach's tablet while the rep is still running. Explore Quko Live Quko Cloud charts for speed, distance per stroke and stroke rate After the session Quko Cloud Every upload becomes splits, stroke-by-stroke analysis, 3D replays and an AI analyst that knows your data. Explore Quko Cloud
For universities and research teams

Bring Kosoku into your next study

Kosoku hardware, stroke-by-stroke exports and an OAuth REST API, with our engineers helping you set up the study, the data access and the integrations.

Talk to our research team

Kosoku needs an active Quko Cloud subscription to unlock every Quko Cloud feature.

Meet Kosoku

Find out what your boat has been telling you

Book a demo and we'll help you find the right setup for your boats and your programme.

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