Garmin Descent S1 Buoy
The Garmin Descent S1 Buoy is a standalone accessory in the Garmin Dive ecosystem. It serves as a surface communication hub that pairs wirelessly with compatible Garmin dive computers—e.g., Descent Mk3i, X50i, and selected older models via the Descent T2 transceiver—to enhance diver supervision during dives
Weighing 981 g (2.2 lb) and measuring 203 mm in diameter and 135 mm in height, the buoy offers portability and resilience in rugged conditions
It uses rechargeable lithium battery power, enabling up to 15 hours of continuous use per charge, and surfaces support staff through Wi‑Fi and multi‑GNSS connectivity within a 60 m range
SubWave sonar allows real‑time underwater communication and tracking up to 100 m, depending on conditions
Key Features of the Garmin Descent S1 Buoy
- SubWave™ sonar network: supports up to eight divers, enabling two‑way preset‑message exchange and diver-to-diver communication
- Real-time surface tracking: surface users see diver location, depth, and approximate tank pressure data via the Garmin Dive app
- “Find My Buoy” navigation: divers underwater can view distance and direction back to the buoy for safe ascent path guidance
- Underwater heat‑map playback: after surfacing, the buoy syncs dive data to reveal dive paths on a heat map for review
- Rugged, buoyant build: IPX8-rated to 10 m, impact-resistant housing weighs just over 2 lb
- Surface connectivity: built‑in Wi‑Fi, multi-GNSS (GPS + GLONASS), and a 60 m topside wireless range
- Rechargeable battery: provides up to 15 hours of continuous dive support
Benefits of Using Garmin Descent S1 Buoy
- Enhanced diver safety: real-time alerts when tank pressure is low or a diver ascends unexpectedly; surface teams can intervene quickly
- Improved situational awareness: both divers and surface crew stay oriented through shared position and navigation info, reducing confusion
- Streamlined communication: eliminates dependency on full-face masks or redundant signals; uses preset messages for efficiency
- Post-dive insights: heat-map playback aids training, debriefing, and dive planning.
- Hands-free, automated: once powered on, the buoy automatically connects and syncs; LED indicators show status (green for power, white for pairing)
- Portable and durable: light enough for travel and tough enough to handle marine conditions.
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Garmin S1 Specifications & Features
- Physical dimensions (WxH): 8.0” x 5.3” (203 x 135 mm)
- Weight: 2.2 lbs (981 g)
- Battery type: Internal rechargeable lithium-ion
- Battery life: up to 15 hours
- Charging method: Garmin proprietary clip charger cable with USB-C connector
- Connectivity: BLUETOOTH®, Wi-Fi®, ANT®, Subwave™
- Sensors: GPS, GLONASS
- Water rating: IPX8 to 10 m
- Surface transmission range for Wi‑Fi technology: Up to 60 m (197 ft)
- Underwater transmission range for SubWave sonar technology: Up to 100 m (328 ft) line of sight
What's in the Box
- Descent™ S1 buoy
- Carrying case
- Charging/data clip
- Tether
- Documentation
What is the range of the Garmin Descent S1 Buoy?
It supports diver-to-buoy sonar communication up to 100 m (328 ft) under ideal conditions—surface choppiness or obstructions may reduce it
How does the buoy communicate with divers?
It uses SubWave sonar to exchange preset messages and to send navigational guidance, while topside uses the Garmin Dive app via Wi‑Fi and GNSS.
Can it track multiple divers at once?
Yes—up to eight divers with compatible Garmin Descent dive computers and T2 transceivers can connect simultaneously
Is the Garmin Descent S1 Buoy waterproof?
Yes—it’s rated IPX8 for up to 10 m depth durability and built to withstand rough marine conditions
How long does the battery last per charge?
The buoy runs for approximately 15 hours on a full charge—enough for a full day of dive activity
