Feature: 1. Affordable ultra‑compact Class D fixed installation VHF radio, dual receivers, independent DSC dedicated receivers. 2. Manually enter GPS latitude, longitude and time. Dual tri‑watch function, simple to operate icon/menu system. 3. IPX7 waterproof structure (3.3ft water depth, lasting for 30 minutes). Support speaker vibration drainage function and weather channel alert. 4. Support normal scan and priority scan. Allows you to query the DSC call reception and transmission records. 5. Standard NMEA interface (RS‑422 protocol). Full dot matrix display. With 16K0G3E (FM) and 16K0G2B (DSC) modulation methods. 6. Optional channel number display digits: 3 digits (01B), 4 digits (2001). Built‑in GNSS module, support GPS, GLONAS, SBAS atellite‑based. 7. Augmentation system (WAAS / EGNOS / MSAS / GAGAN) (only for RS‑509MG). The simple combination of arrow keys and programmable soft keys can achieve smooth operation. 8. Support the latest manine channel standard and DSC protocol standard. DSC distress calls in 11 categories, all DSC calls in 3 security categories. Specification: Item Type: Marine Boat Radio Material: ABS Frequency Range: TX: 156.000- 162 000MHz RX: 156.000- -163.425MHz Output Power: 25W Modulation Method: 16K0G3E (FM), 16K0G2B (DSC) Frequency Stability: +/-5PPM Working Voltage: DC13.8V (t 15%) Channel Spacing: 25kHz Operating Temperature Range: -20℃ -+60℃ Antenna Impedance: 50Ω Output Impedance: 4Ω. Package List: 1 x DSC Boat Radio 1 x Mounting Base Bracket 2 x Fixing Knob 1 x Power Connection Cable 1 x Walkie-Talkie Hanging Buckle 4 x Mounting Screw 4 x Gasket 1 x Manual