Knowledge Base

SpeedCoach Red/Gold

SpeedCoach Red/Gold

The most effective way to troubleshoot the SpeedCoach unit is to narrow the variables and determine which component is at fault. In order to do this, you will need to trade units with a fellow rower. You should use his or her unit (with the same stroke-mode setting and calibration number as your unit) on your dock station. The fellow rower should use your SpeedCoach (with the same settings) on his or her docking station. This will allow you to determine if the control unit or the docking station is at fault.

Cheet Sheet for troubleshooting SpeedCoach Red or Gold Units:
ProblemPossible ReasonPossible Solution
stroke rate is doubled unit is in 1-STROKE mode hold bottom button until "2-STR" appears on display, then release
no stroke rate or speed readings unit is not in contact with mounting bracket push unit onto mounting bracket until loud click is heard. Be sure Lanyard is not interfering with the connection.
no speed/split readings impeller is not installed install impeller
no speed/split readings impeller is not installed close enough to the blue sensor mount impeller within 10" of the blue sensor
inaccurate speed/pace reading incorrect calibration # reset calibration #
no stroke rate readings magnet is not passing close enough to black sensor adjust magnet installation so that the magnet passes within 3/4"'s of one another
no stroke rate readings magnet and black sensor are not correctly aligned adjust installation so that magnet and black sensor are directly aligned with one another
no stroke rate, timer, or distance possible seat sensor failure put SPC in 0-stroke mode to bypass the seat sensor
timer does not start unit in STOP or MEMORY mode clear STOP

SpeedCoach/StrokeCoach Instruction Manuals

This is a quick start guide for using NK LiNK Logbook, including streaming live data, uploading data and reviewing data sessions.

SpeedCoach Gold User Guide, Installation, Operation, Memory, Calibration, Battery Replacement, Maintenance

SpeedCoach and SpeedCoach with Heart Rate Belt Instruction Manual

SpeedCoach GPS Model 2 Includes Training Pack Upgrade, Installation, Basic Operations, Setup Menu, Advanced Setup, Specifications, Menu Navigation, Memory, GPS Function and Accuracy, Workouts, Impeller Calibration, Battery Use and Charging

SpeedCoach OC Model 2 Instruction Manual

SpeedCoach Red User Guide

SpeedCoach SUP & SpeedCoach SUP with Heart Rate Belt Instruction Manual

SpeedCoach SUP Model 2 Includes Training Pack Installation, Basic Operations, Setup Menu, Advanced Setup, Specifications, Menu Navigation, Memory, GPS Function and Accuracy, Workouts, Impeller Calibration, Battery Use and Charging

SpeedCoach Interface Upload Software Instructions

SpeedCoach XL Coach's Mount

SpeedCoach XL Instruction Manual for XL1 and XL2

SpeedCoach XL3 and XL4 User Guide

StrokeCoach Instruction Manual


SpeedCoach/StrokeCoach Wiring

SpeedCoach Impeller Only Wiring Installation

Goes into detail on the different harnesses and mounts that you can use with a SpeedCoach.

SpeedCoach Wiring Diagram for a Single (1x)

SpeedCoach Wiring Installation Instructions


SpeedCoach/StrokeCoach Downloads

NK_SUP_Training_Book_Chase

Example of exported CSV file from SpeedCoach Model 2. Does not include oarlock data.

Example of exported CSV file from SpeedCoach Model 2. Does not include oarlock data.

Program for downloading data from the SpeedCoach Gold or SpeedCoach XL products only.

Release notes for SpeedCoach GPS, SUP & OC (Version 2.21) - 10/15/18

SPC_GPS_2_Just_Go_Files_2

Version 2.21 - 10/12/18 Fixes issue where fuel gauge was overestimating remaining battery life in certain units.

Version 2.21 - 10/12/18 Fixes issue where fuel gauge was overestimating remaining battery life in certain units.

Example SUP data that can be exported from SpeedCoach SUP Model 2 as a CSV file

SUP Training Program from Eccentric Motion System / Paddle Power Trainer Mick

Example SUP workout data that can be exported from SpeedCoach SUP Model 2 as a CSV file


SpeedCoach/StrokeCoach Troubleshooting Documents

Comparison of SpeedCoach Model 2 Units: Rowing vs SUP vs OC

Some guidance on sending exported FIT files to 3rd party sites.

A quick solution to fixing a heart rate belt that is displaying erratic readings

Attached is a workaround to have NK LiNK for Windows display correctly on high definition monitors

Replacing the Stroke Rate Sensor (HD Harness, Part Number 0214)

Replacing the Stroke Rate Sensor (Legacy Harness, Part Number 0212)

This is a quick guide on what to look for if you changed batteries and the power no longer comes on with your SpeedCoach Red or Gold or Strokecoach.

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  • 2-STROKE mode is for the majority of rowers. For this mode, input comes from the SeatSwitch and the magnet under the seat. It counts once for every two passes over the SeatSwitch.
  • 1-STROKE mode is for kayakers ONLY. Input comes from the paddle switch sensor.
  • 0-STROKE mode is for those individuals not using the seat sensor (This does NOT work for kayakers). The input for this mode comes from modulations in the speed of the boat.
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You will first need to create an account if you do not already have one. After you create an account, sign in. Click on your account name at the top of the page and select My Account. On the left of the screen, you will see Product Registration, select this option. Enter your purchase date, serial number and product name into the fields and then select Save.

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The hard reset will clear all memory and restore the factory default settings. If your accumulated distance is important to you, please record it. If you ran the calibration routine and changed the calibration number, please record the calibration number.

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SpeedCoach/StrokeCoach Wiring

SpeedCoach Impeller Only Wiring Installation

Goes into detail on the different harnesses and mounts that you can use with a SpeedCoach.

SpeedCoach Wiring Diagram for a Single (1x)

SpeedCoach Wiring Installation Instructions

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To select a particular Stroke Mode turn on the unit and hold the button down until either 2,1, or 0-STR is displayed in the bottom left window. Release the bottom button when the desired setting appears.

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Using a nickel, since other coins tend to destroy the plastic, remove the battery port door. Then, remove the battery. While the battery is out, depress the top and bottom switches for ten seconds and then release them. Wipe the battery clean so that it is void of fingerprints and any other debris. Re-install the battery with the negative side down. Make sure the O-ring is correctly positioned in the case groove. Re-align and install the battery port door, making certain you completely seal it. Now, turn the unit on. If the accumulated distance does not read zero, repeat the hard reset. Once the accumulated distance is zeroed, you can enter a recorded calibration number if you have one. If you were experiencing difficulty with your stroke rate readings, put the unit in the 0-Stroke mode.

Doing a hard reset quick resets calibration to 1.000 and the stroke mode to 2-STROKE mode.

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Please see our guide:

SpeedCoach/StrokeCoach Troubleshooting Documents

This is a quick guide on what to look for if you changed batteries and the power no longer comes on with your SpeedCoach Red or Gold or Strokecoach.

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Your unit is probably in 1-Stroke mode. To change your unit from 1-Stroke mode to 2-Stroke mode, hold the bottom button until “2-STR” appears on the display, then release it.

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In this case, it is most likely the case that the unit is not in contact with the mounting bracket since no boat information is reaching the unit. Push the unit onto the mounting bracket until you hear a loud click. Be sure the lanyard is not interfering with the connection.

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First of all, you will not get these readings unless you have the impeller installed in your boat. While your SpeedCoach can execute other functions without the impeller, it is essential that the impeller be installed for split readings.

If you do have this problem with an installed impeller, you need to make sure that the impeller is installed close enough to the blue sensor. The impeller must be mounted within 10” of the blue sensor. See SPC installation instructions for more information.

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You have an incorrect calibration number and must reset the calibration of your unit. See unit instructions for more information.

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This is happening for one of two reasons. It could be that the magnet is not passing close enough to the black sensor. To solve this problem, you must adjust the magnet installation so that the magnet passes the black sensor within 3/4”s.

The other possibility is that the magnet and black sensor are not aligned correctly. See SPC installation instructions for more information.

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This could possibly be a seat sensor failure. To make certain that it is a problem with the sensor and not the unit, put the SpeedCoach in 0-STROKE mode to bypass the seat sensor.

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Your unit is in STOP or MEMORY mode. You just need to clear STOP.

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  • The impeller should go 16’3” from the bow. If elsewhere on the boat, the SpeedCoach should be recalibrated. It should be positioned approximately under the footstretchers. While the impeller does not need to be on the centerline, it must be submerged (if NOT centered be sure to still align the sensor accordingly with the movement of the boat). The impeller can be adhered to the hull of the boat with double-sided tape (included with purchase) or good electrical tape.

  • The SpeedSensor, which is the blue sensor provided, should be as close to the impeller as possible (maximum or 11”). You install the SpeedSensor inside the hull (i.e. the opposite side from the impeller). The SpeedSensor can either be installed perpendicular to the impeller when positioned directly above it, or parallel to the impeller when it is located one impeller length in front or behind of the actual impeller. Although inside the hull, the SpeedSensor still must be fixed securely to the shell. Make sure you clean the surface well before taping it to the boat.

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  • The SeatSwitch, or black sensor, should be fixed mid-way through the length of the slide. This will ensure the best reading. Additionally, it MUST be oriented perpendicularly to the axis of the boat.


  • The magnet must pass over the SeatSwitch. Therefore, it too must be oriented perpendicularly to the axis of the boat. You also must make sure that it is mounted to the seat within 3/4” and 1 1/2” of the deck.

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The SpeedCoach is factory calibrated to provide reasonably accurate performance in most shells IF the impeller is installed approximately 16’3” (5m) from the bow. Calibration is an optional step, which allows the display unit to compensate for different impeller locations and to perform very accurately. You do not need to calibrate your system if you are only concerned with comparing performance on a day-to-day basis. However, calibrating your unit will make certain your splits are accurate.

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  1. To calibrate your system, row or paddle over a measured distance on still water (on moving water row or paddle both up and down stream and average the results shown on your display). Then, use the following formula to obtain your calibration value: (Old Cal Value) (True Distance) / (Displayed Distance) = New Cal Value
  2. Make a record of your calibration value for future reference. If you move your unit to a new boat, or modify the location of your impeller, you may want to recalibrate it. Remember, calibration is boat and location specific!
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  1. If possible, try a unit that is known to work with the suspect wiring to determine whether the problem is your unit or the wiring. Be sure the calibration number and stroke mode are set the same as your unit.
  2. Check the wiring for visible cuts or nicks.
  3. Check that both sensors are correctly aligned (i.e. the black sensor aligned properly with the magnet and the blue sensor aligned properly with the impeller).
  4. Check the impeller for debris and make sure it is not damaged.
  5. Check that the metal contacts on the unit depress easily and rebound level to the back surface of the unit.
  6. Check the metal contacts on the mounting dock and make sure they are flush with the surface of the dock.
  7. Clean the contacts on both the control unit and the docking station with Bon Ami (a non-abrasive cleanser available at most local stores).
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  1. This is probably a problem with your SeatSwitch (the black sensor). You should test your seat sensor by placing the unit in 0-STROKE mode to check if the unit is functioning correctly. If all readings are correct in 0-STROKE mode, the problem is either the SeatSwitch or the magnet (this test will NOT work for kayakers).
  2. You should check the installation of both your SeatSwitch and magnet. See SPC installation instructions for more information.
... Read more
  1. This is probably a problem with your SeatSwitch (the black sensor). You should test your seat sensor by placing the unit in 0-STROKE mode to check if the unit is functioning correctly. If all readings are correct in 0-STROKE mode, the problem is either the SeatSwitch or the magnet (this test will NOT work for kayakers).
  2. You should check the installation of both your SeatSwitch and magnet. See SPC installation instructions for more information.
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No, the SpeedCoach has a lot of dense electronics inside and this causes it to not be buoyant. Please make sure you secure your SpeedCoach to your mount using the lanyard. Extra precautions such as the NK Life Preserver Float should also be considered.

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Check the battery voltage and/or replace the existing battery.

The CR2032 is a common battery available at most local stores. A CR2032 has an average expected battery life of 400 hours.

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Installation instructions can be found here . Essentially you want make sure that the impeller is mounted closer to the bow then the stern. We give a guideline that it should be within 6 meters from the bow. You really want to avoid mounting toward the stern as this will introduce more water turbulence and give less accurate readings. For best results, please run the impeller calibration routine to enter the appropriate impeller calibration reading. Calibration should be done on a per boat basis, so if you use the unit in different boats, you should run the calibration routine on each one.

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