Known limitations — Concepts (site-wide index)

This page collects the honest caveats documented across the site. Each area also keeps its own detailed list; the links point to the authoritative source.

Mocap#

• Inertial drift. All inertial tracking accumulates error: heading drift (orientation about the vertical axis) and root drift (world position). Long recordings drift more. This is inherent to the method, not a fault. → Concept - Mocap, Studio - Known Limitations
• 9-axis mode is experimental. The magnetometer-enabled 9-axis mode is still in development, available only in test mode, and not the default. Use 6-axis mode in standard cases. → Concept - Mocap
• Magnetic interference. 9-axis mode is degraded by nearby ferromagnets, large metal objects, and strong electromagnetic fields; the suit may in turn disturb sensitive equipment nearby. → Hardware - Known Limitations
• 6-axis calibration is not persisted. It is not saved between sessions, so recalibrate each time and again as drift accumulates. → Control Center - Known Limitations

Haptics#

• Per-person calibration required. Sensation depends on electrode-to-skin contact and individual skin properties, and varies from session to session; calibration is required and some discomfort can remain even when calibrated. → Concept - Haptics, Hardware - Known Limitations
• EMS parameters are not gated by channel. Nothing prevents EMS-strength effects on channels that are not over a muscle; choosing the right channels is the author's responsibility. → Concept - Haptics

Biometry (PPG)#

• HRV start-up delay. HRV is calculated from many inter-beat intervals, so values are unavailable for a short buffering period after the sensor starts. → Concept - Biometry (PPG)
• Heart rate during movement. Motion artifacts can make direct measurement unreliable; values are then extrapolated and marked with the is_valid flag. → PPG API

Hardware and operating envelope#

• Operating range. Rated for 5 to 35 °C and 20 to 65 % relative humidity (storage up to 85 % RH). Operation outside this range is not guaranteed to be safe or accurate. → Hardware - Known Limitations
• Session length. Not intended for daily use; keep a single session to about one hour. This is a safety constraint, not a technical cap. → Hardware - Safety
• Power and connectivity prerequisites. XR5 includes a power bank (shipped separately) and a Wi-Fi adapter in the case; both are easy to overlook on first unpack, and the adapter is needed when the host PC has no Wi-Fi. → Hardware - Known Limitations

Software#

• Windows only. Windows 10/11 64-bit; no macOS or Linux client. → Control Center - Known Limitations
• Wi-Fi-only communication. No wired data path, and direct mode needs one dedicated adapter per device. → Control Center - Known Limitations
• Offline-mode feature loss. Remote features, sync, notifications, and updates require online sign-in; offline-paired devices need re-pairing after going online. → Control Center - Known Limitations
• Firmware is not downgradable. Updates are one-way. → Control Center - Known Limitations
• Calibration must precede capture. Uncalibrated mocap or haptic data is unreliable. → Studio - Known Limitations
• Closed-loop timing ceiling. SDK real-time loops are bounded (about 100 Hz) by blocking calls, which matters for clinical-FES style workflows. → Studio - Known Limitations
• Large datasets. Long, multi-stream recordings are heavy to load and visualise on minimum-spec hardware. → Studio - Known Limitations

By area#

• Hardware → Hardware - Known Limitations
• Studio → Studio - Known Limitations
• Control Center → Control Center - Known Limitations