FDS SonoAlti 4V: The Altimeter That Talks to You
The Freefall Data Systems SonoAlti 4V is the world’s first speaking audible altimeter with built-in voice functionality—no external hardware required. Featuring professional voice actress audio, WebUSB configuration, and 2-in-1 capability (speaking + traditional beeps/sirens), the SonoAlti 4V delivers constant altitude awareness unlike any traditional audible altimeter.
Key Features:
- Built-In Speaking Capability: Professional voice actress announces altitudes in user-defined increments
- WebUSB App Configuration: First skydiving altimeter set via browser-based WebUSB interface
- Dual Audio Modes: Speaking announcements PLUS traditional beeps and sirens
- Compact Anodized Aluminum Case: Smaller than 3V, longer battery life, USB-C charging
- 100+ Factory Sounds: Unlimited custom spoken notifications (“breakoff,” “track,” etc.)
Who Should Use the SonoAlti 4V: Perfect for pilots building altitude awareness skills, AFF students learning timing, experienced jumpers wanting constant feedback, angle jumpers, formation organizers, or anyone who prefers continuous altitude updates over discrete beeps.
How It Works: The SonoAlti 4V provides regular spoken altitude announcements throughout your skydive—hearing “nine thousand,” “eight thousand,” “seven thousand” builds timing skills and altitude pictures far better than traditional beeps at preset altitudes. The electromagnetic speaker is loud enough for most helmets without external hardware.
Configuration & Customization: WebUSB-based configuration provides unprecedented control. Set unlimited altitude announcements for freefall, canopy, and ascent phases. Customize announcement increments (every 1000ft, every 500ft, etc.). Add your own sound files. Create and share custom presets with teammates. Adjust freefall thresholds for wingsuit or swoop modes.
Technical Specifications:
- Battery Life: ~300 jumps or 4+ months on rechargeable lithium polymer
- Charging: USB-C (approximately 2 hours full charge)
- Speaker: Electromagnetic (not piezo) for voice quality
- Configuration: WebUSB app (no mobile app needed)
- Presets: Three custom user presets, button-selectable on altimeter
- Automatic Features: Auto-calibration to local elevation, landing zone altitude adjustments
vs Traditional Audibles: Traditional audibles beep at specific altitudes (e.g., 6000ft, 4000ft, 3000ft). The SonoAlti 4V can announce altitude continuously in customizable increments, providing far more information. It can ALSO emit beeps and sirens for critical alerts, giving you the best of both worlds.
Training Benefits: Hearing spoken altitudes while simultaneously seeing your altitude picture trains your eyes and timing. Many jumpers are unaware how fast they actually lose altitude—continuous voice callouts build this awareness naturally.
The altimeter that talks to you. Constant altitude awareness redefined.
