Anna Werrett
The Coxmate GPS and SX units are tools used to monitor and improve performance in rowing and canoeing. They can be used to track important data such as speed, stroke rate, and distance per stroke. The GPS unit was originally developed for rowers to measure these metrics and uses an internal accelerometer and GPS data to determine distance per stroke. The SX unit features protective covers for all external connectors and includes short circuit protection for the speaker.
| Characteristics | Values |
|---|---|
| Use | Measurements for rowers and coaches |
| Who uses it | Rowers, coaches, and coxswains |
| What it measures | Stroke rate, boat speed, distance per stroke |
| How it works | Calculates acceleration of the boat and uses GPS data |
| Other features | Heart rate monitoring, auxiliary switch for foot operation, waterproof, floating, GPS calibration, long battery life |
| Cost | £160 for the Coxmate HC unit |
What You'll Learn
The Coxmate GPS unit
To calculate the distance travelled per stroke, the formula is: distance = speed x time. This can be calculated manually or using a FitBit or similar device.
The unit comes with a protective neoprene case, a mounting adapter kit with three mounting options, a lanyard, and a USB cable for connection to a computer. It also includes a 12-month subscription to PC Analysis software, which can be used to record and analyse workouts and create courses.
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The Coxmate SX unit
The unit is widely used in rowing programs, such as the one at Firbank Grammar School in Melbourne, Australia, where it assists coxswains in maximising the effectiveness of each stroke. The Coxmate SX unit is an invaluable tool for novice and elite rowers, helping them optimise their stroke rate and rhythm to achieve better results.
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The micro impeller
The Coxmate micro impeller is a speed sensor designed to be used with the HC and SX from Coxmate. It is smaller than its predecessor, with low drag characteristics, making it ideal for racing. It can also be used with the Speed Coach (XL) from NK, but calibration is required as it rotates 2.5 times faster than the NK impeller.
The Coxmate HC, designed for coxless boats, is lightweight and compact, and can be mounted in your boat using a wiring loom. The micro-impeller is sold separately and can be used with the HC unit. The HC has a configurable display that can show variables such as rating, speed, time, distance, average speed, distance per stroke, stroke count, heart rate, and ratio (minimum/maximum speed per stroke).
The HC unit also has a substantial memory for storing data, a real-time clock for time/date stamping rowing records, and the ability to display data concurrently on two HC units. The mounting bracket is compatible with the NK Speedcoach.
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Heart rate monitoring
The Coxmate GPS is a waterproof sports computer that can be used to monitor your heart rate. It is a small, wearable device that can be paired with an optional chest strap to measure your heart rate. This chest strap is available to purchase separately.
The chest strap heart rate monitor is considered the gold standard for accuracy in heart rate measurement. It uses electrical detection to track your heart rate by detecting the electrical activity of your heartbeat. The chest strap must be wet or used with a conductive gel to improve electrical conduction.
The Coxmate GPS can also be used to track other metrics such as pace, speed, distance, and time. It has a rechargeable lithium battery and a USB port for charging and connecting to a PC. The device offers 3.5GB of data storage, which is enough to store data for more than 100,000 strokes.
In addition to the chest strap, there are several other types of heart rate monitors available, including:
- Wrist- or forearm-worn wearables: These devices use optical detection to track your pulse rate by detecting the expansion of your arteries as your heart pumps blood through them. They are very accurate when you are resting or walking, and many are also accurate for running or cycling. However, they may give inaccurate readings during exercises that involve using your arms, such as rowing.
- Smart rings: These devices are worn on a finger and use optical detection to track your heart rate and other vital signs. They are still quite new, and there is limited data on their accuracy.
- Pulse oximeters: These devices, often used in hospitals, clip onto a finger and use optical detection to track pulse rate and blood oxygen levels. Portable, battery-powered versions are also available for personal use.
- Smartphone apps: Some smartphone apps can measure your pulse rate by holding your finger to the camera lens or using the camera to detect changes in your skin. However, they may be prone to errors as smartphones are not designed for this purpose.
While these devices are valuable tools for monitoring your health and fitness, they are not as accurate as approved medical devices and should not be used as a substitute for medical care.
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The GPS calibrator
The Coxmate GPS unit is designed to assist rowers and coxswains in monitoring their speed, stroke rate, and distance travelled. It provides real-time data, including distance per stroke, which can be used to inform and adjust training strategies. This information can be viewed via the unit's 2" colour touchscreen, which is responsive even when the user is wearing gloves.
One of the key advantages of the Coxmate GPS is its versatility in mounting options. It comes with three different mounting choices: the standard NK strokecoach mount, a suction cup for flat surfaces, and an adapter that fits into the black runners for the foot stretchers. This ensures that users can find a secure and convenient mounting solution that suits their needs.
In addition to its core functionality, the Coxmate GPS offers several additional features. It includes a heart rate monitor that supports ANT+ technology, allowing for automatic connection with Garmin or Wahoo HR belts. The unit also provides programmable workouts and the ability to race against a virtual boat or follow a pre-set course.
When compared to its main competitor, the Nielsen Kellerman GPS 2.0, the Coxmate GPS offers a more affordable option at less than half the price. While the NK GPS may offer slightly higher quality in terms of screen clarity and GPS speed, the Coxmate GPS is still highly reliable and provides accurate data. The Coxmate GPS also has a longer-lasting battery, providing up to 6 hours of use compared to the NK's 4-5 hours.
Overall, the Coxmate GPS is a robust and feature-rich tool for rowers and coxswains. Its ease of use, customisation options, and competitive price make it a popular choice for those looking to improve their performance and gain valuable insights into their rowing technique.
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Frequently asked questions
Tracking distance per stroke is a great way to get rowers to think about how they move the boat and improve their performance. It promotes an effective drive phase and an efficient recovery phase.
You can use rowing technology, such as the Coxmate GPS and SX units, which have GPS technology to monitor rate, boat speed, and provide distance per stroke data in real time.
The Coxmate GPS unit has an internal accelerometer that measures the acceleration of the boat to calculate stroke rate, and it uses corresponding GPS data to determine distance per stroke.
You need to adjust the sensitivity and units, and you can also program workouts. It is recommended to spend some time getting familiar with the user interface before taking it out on the water, as it is not the most intuitive.
Yes, an alternative device mentioned is the Garmin VivoactiveHR, which can be used to measure stroke rate. However, the Coxmate GPS unit is specifically designed to provide distance per stroke data, which is a key metric for improving rowing performance.
