Using VX Indoor Tracking

Our indoor tracking allows athletes’ speed and distance to be measured using inertial sensors when GPS is not available. Bringing the VX Sport system to sports such as basketball has been a priority for us, but we also wanted to add functionality for teams that play and train both indoors and outdoors.

To use Indoor tracking you must have indoor capable units (G4: VX95, VX235, VX305 or VX350b. G5: VX195, VX205, VX315, VX435, VX550b or VXWR5).

VX Indoor Metrics:


By HR Zone

Duration Total Average Speed
Duration HR High Intensity Maximum Speed
Total Distance Average Heart Rate
Distance Rate Maximum Heart Rate
Average Speed Distance
% Average Speed Distance Rate
Max Speed Duration
% Max Speed Energy Consumption
Energy Consumption TRIMP
Jump Count* Average Heart Rate Variability
Max Jump Height*  
Jump Rate*  
Impact Rate*  

*Jump and Impact metrics only available on certain models.


VX Indoor Calibration:

To ensure indoor tracking is accurate each athlete using VX indoor MUST complete a simple calibration session to relate their unique gait to the inertial sensor data. The calibration requires GPS as a reference source so the session must be completed outdoors on an athletics track or similar, and must be away from sources of interference (e.g. tall buildings & dense foliage). Please ensure the track you select will not have any sharp changes of direction (e.g. a soccer field) or any obstacles that will slow down the athlete (e.g. sharp turns and steps). Note: units should now be issued to "Indoor Calibration," rather than any other indoor sport.



I am using Generation 4 units (95, 235 or 350’s) but am still not recording any indoor results.

  • In order to apply the new indoor feature there is a few things you need to have running before data collection can take place. These being:
  • Appropriate Firmware (V2.00-76 - 27th July 2016 or newer). Please use this link to help in the process
  • VX Sport Software version over
  • Having the Device(s) issued to an Indoor Sport
  • Each athlete using the indoor system needs to perform a “calibration test” using an indoor capable unit, running suitable firmware and software, as described above.

Why is my calibration not working?

  • Calibration requires the selected unit(s) to be issued to an indoor sport but to perform the calibration process outside. The process is most effective when running on a straight line or a athletics track.
  • The calibration requires the athlete to use their relative range of stride length whilst moving along a straight course. Beginning from a slow walk all the way to a maximal stride length during a high intense effort. The incremental increase of the speed is seen as the most important factor so staying away from any sudden movements or changes of direction is key.
  • If needed, please run the calibration test up to 5 times if needed. Resting periods can be as long as needed, making sure the unit is NOT turned off during this time.

Why am I not seeing accurate data in a controlled testing state after calibration has been successful?

  • Defining accurate data has been our major focus when developing the Indoor system. We ensure that all metrics are within 10% of our industry leading GPS measurements. However, our algorithms adjust the total amount of metrics given in order to meet our accuracy policy. The reason why specific data might not be seen as accurate can be affected by the following factors:
  • Completing a successful calibration directly customizes the step algorithm to the individual athlete. On average the distances are accurate for training or match situations, but individual movements at constant speed could be biased above or below the actual distance.
  • The VX Sport indoor tracking algorithm has been designed to accurately capture game type scenarios. Short tests and drills may show slightly skewed data, but over longer sessions will show more accurate results.
  • The step algorithms for indoor tracking calculate all distances based on motion, and the step count of the athlete. The more steps you take the more distance you would gather.

My training sessions involve use of both indoor and outdoor facilities? What should my process be in order to be most efficient?

  • As outlined in the Indoor Tracking Instructions document linked above, we recommend changing your default sport to the indoor version e.g. “Basketball - Indoor”. This will filter out the metrics that are not available for indoor tracking. If you will be using the system both indoor and outdoor, we recommend you set your default sport to the outdoor version of the sport e.g. “Soccer”. Your training report will then show ** when the unit has been used in indoor mode for specific metrics that can’t be viewed.
  • You will need to ensure you are re-issuing your units whenever you switch between an outdoor sport and an indoor sport. The easiest way to do this is through the Manage Tab, Select all units - Issue Devices, Issue to the desired sport (If you are Indoors use the indoor sport (- Indoor), if outdoors use the regular sport.
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