Inside-Out or Base Stations: VR Tracking Compared

What is inside-out tracking?

Inside-out tracking uses cameras built into the VR headset to observe the room and your controllers. The headset processes these images to determine its own position and the position of the controllers relative to it. No external sensors or base stations are needed, so you can set up the headset anywhere without placing equipment around the room.

Headsets like the VIVE Focus Vision use inside-out tracking. The VIVE Focus Vision page states it is "base station-free" and uses cameras and computer vision for tracking. Many standalone and PC VR headsets today rely on this method because it simplifies setup and makes the headset portable. For a list of headsets that use this method, see our best standalone VR headsets guide.

What is base station tracking?

Base station tracking uses external devices placed in the room that emit lasers or infrared light. The headset and controllers have sensors that detect these signals, allowing the system to calculate their positions with high precision. This method requires mounting the base stations on walls or stands and ensuring they have a clear line of sight to the play area.

The Valve Index is a well-known headset that uses base stations. Its product page lists "Requires Base Stations" for the headset and controllers, and it sells base stations separately. This tracking method has been used in many PC VR systems for years and is favored for large, dedicated play spaces. If you are considering a PC VR setup, our best PC VR headsets guide can help you compare options.

Setup differences: no hardware versus placing stations

Inside-out tracking requires no additional hardware. You put on the headset, and it starts tracking immediately. This makes it ideal for users who want to move the headset between rooms, take it to a friend's house, or simply avoid the hassle of mounting equipment. The VIVE Focus Vision, for example, is a standalone headset that also works as a PC VR headset, and its inside-out tracking means you can use it anywhere without preparation. For a headset that works both standalone and with a PC, see our best HTC Vive headsets guide.

Base station tracking requires you to set up two or more base stations in the room. They need to be placed at opposite corners, elevated, and angled toward the play area. This takes time and may require drilling or using stands. Once set up, the tracking is consistent, but moving the system to another room means reinstalling the stations. The Valve Index page recommends two or more base stations for full coverage. For a premium PC VR experience with base stations, check our best premium VR headsets guide.

Occlusion and tracking volume

Occlusion happens when an object blocks the line of sight between the headset and the controllers or base stations. With inside-out tracking, if you move your hands behind your back or below your waist, the headset cameras may lose sight of the controllers, causing tracking to pause or drift. Modern inside-out systems use multiple cameras and algorithms to reduce this, but it can still occur in certain positions.

Base station tracking is less prone to occlusion because the stations are placed around the room. If one station loses sight, the other may still see the controller. However, if you block both stations' view, tracking can be lost. The tracking volume is also larger with base stations because they can cover a wider area, especially when using four stations. For large play spaces or setups where you need to turn around frequently, base stations provide more consistent coverage. To understand how tracking volume affects your play space, read our room-scale VR space article.

Accuracy and precision in general terms

Both tracking methods are capable of delivering accurate positional data for VR experiences. Base station tracking has historically been considered more precise because the lasers provide a fixed reference frame. This makes it popular for applications like flight simulation and sim racing, where even small movements matter. Inside-out tracking has improved significantly and is now used in many high-end headsets, including those with eye tracking and hand tracking.

The VIVE Focus Vision includes eye tracking and hand tracking alongside its inside-out tracking, showing that inside-out can support advanced features. The choice between the two often comes down to your specific needs rather than a clear winner in accuracy. For more on how tracking affects simulators, see our VR for simulators article.

Which headsets use each method?

Inside-out tracking is the standard for most modern VR headsets. The VIVE Focus Vision uses inside-out tracking and does not require base stations. The PlayStation VR2 also uses inside-out tracking with cameras on the headset. Many standalone headsets from Meta and Pico rely on inside-out tracking as well. For a list of Meta headsets, see our best Meta VR headsets guide.

Base station tracking is used by the Valve Index and some older HTC Vive models. The Valve Index page explicitly requires base stations for operation. Some premium PC VR headsets still offer base station tracking for users who want the maximum tracking volume and precision. If you are looking for a headset for PC gaming, our best VR headsets for PC gaming guide covers both tracking types.

What to pick for your situation

Questions

Can I use inside-out tracking in a dark room?

Inside-out tracking relies on cameras that need visible light or infrared illumination. Some headsets, like the VIVE Focus Vision, include an infrared floodlight to support tracking in dim spaces. For best results, ensure the room has adequate lighting.

Do base stations need to be plugged in?

Yes, base stations require power. They are typically plugged into a wall outlet or powered via a USB cable. The Valve Index base stations use a power adapter and must be placed within reach of an outlet.

Can I mix inside-out and base station tracking?

Some headsets support both methods. For example, the VIVE Focus Vision can use inside-out tracking for the headset and controllers, and also support VIVE Ultimate Trackers that use inside-out tracking without base stations. However, mixing the two systems on the same headset is uncommon.

Which tracking method is better for large play areas?

Base station tracking generally covers a larger volume because the stations can be placed far apart. Inside-out tracking is limited by the range of the headset cameras, but modern headsets can handle room-scale spaces. For very large areas, base stations are often preferred.

Does inside-out tracking work with glasses?

Inside-out tracking works regardless of whether you wear glasses, as long as the headset fits comfortably. The tracking cameras are on the outside of the headset and are not affected by eyewear.

Are there any headsets that use both tracking methods?

Some older headsets, like the HTC Vive Pro, offered a combination of inside-out and base station tracking through add-on modules. Most modern headsets choose one method. The VIVE Focus Vision uses inside-out tracking but supports external trackers that also use inside-out technology.

Is base station tracking more accurate than inside-out?

In general terms, base station tracking can provide higher precision because the lasers create a fixed reference. However, inside-out tracking has improved greatly and is accurate enough for most VR experiences. The difference is most noticeable in professional or simulation use cases.

Can I use a headset with inside-out tracking for PC VR?

Yes, many headsets with inside-out tracking can be connected to a PC via a link cable or wirelessly. The VIVE Focus Vision, for example, supports DisplayPort mode for PC VR. Inside-out tracking works the same whether the headset is in standalone or PC VR mode.