Size: Compact, typically 5-12 inches in diameter for display units; handheld models range from 3-7 inches.
Grade: IPX7 or higher for waterproofing; meets IEC 60945 maritime standards.
Viscosity: N/A (not applicable to GPS receivers).
Buoyancy: Some models float; buoyancy varies by design (check manufacturer specs).
Material: High-impact plastic, corrosion-resistant metals (e.g., aluminum), and reinforced glass for displays.
Frequency: L1/L2/L5 bands for multi-GNSS support (GPS, GLONASS, Galileo, BeiDou).
Accuracy: 1-5 meters (standard GPS), <1 meter with WAAS/DGPS, cm-level with RTK.
Power Supply: 12-24V DC (marine systems), battery-operated (handhelds: 4-20 hours).
Connectivity: NMEA 0183/2000, Bluetooth, Wi-Fi, USB, Ethernet.
Operating Temperature: -15°C to 55°C (5°F to 131°F).
Charts: Supports C-MAP, Navionics, Garmin BlueChart, etc.
Mounting: Fixed (flush/ bracket) or portable (suction cup/ handheld).