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Uniden
Uniden UM435 25W Fixed Mount VHF Marine Radio - Built-in GPS - S.A.M.E. Weather - White
Important: FCC Ship Station License may be required for installation and use on certain vessels. MMSI registration is required to use DSC emergency calling features. Check requirements at fcc.gov before deployment.
The Uniden UM435 is a feature-rich 25-watt fixed mount VHF marine radio with built-in GPS, making it a complete communication and safety solution for recreational and commercial vessels. Unlike the UM385 which requires an external GPS receiver, the UM435 includes integrated GPS functionality for automatic position reporting during DSC distress calls, eliminating the need for additional hardware and simplifying installation.
This front-panel mounted radio combines essential safety features with user-friendly operation, featuring a large backlit display, intuitive controls, and the advanced Triple Watch Plus function that monitors multiple channels simultaneously. The built-in GPS automatically provides your vessel's coordinates during emergency transmissions, ensuring rescue services know exactly where to find you.
KEY FEATURES & BENEFITS:
- Built-in GPS Receiver: Integrated 66-channel GPS provides automatic position data for DSC calls without requiring external hardware—simply connect the radio and you're ready for safe operation
- 25W High / 1W Low Power Output: Full 25-watt transmission for maximum range up to 20+ nautical miles, with 1-watt low power for close-range communication and battery conservation
- DSC Digital Selective Calling with GPS: Send automated distress signals with your precise coordinates, dramatically improving rescue response times in emergencies
- NMEA 0183 In/Out: Share GPS position data with chartplotters, autopilots, and other marine electronics for complete navigation system integration
- Triple Watch Plus Monitoring: Simultaneously monitor Channel 16 (emergency), your working channel, and one priority channel without manual switching
- S.A.M.E. Weather Alerts: Receive localized NOAA weather warnings filtered by your specific geographic area, eliminating irrelevant alerts from distant regions
- IPX4/JIS4 Waterproof Rating: Protected against water splashing from any direction for reliable operation in marine environments
- All Marine Channels: Complete access to USA, Canadian (CMB "B"), and international 4-digit channels for worldwide compatibility
- Memory Scan Function: Automatically scan programmed channels to monitor multiple frequencies and catch important communications
- Customizable Channel Names: Assign descriptive names to frequently used channels for instant recognition and faster channel selection
WHY CHOOSE THE UM435 OVER THE UM385:
- Built-in GPS: No need to purchase separate GPS receiver (saves $100+)
- Simpler Installation: One less device to mount and wire
- Immediate DSC Capability: Full position reporting functionality out of the box
- Cleaner Installation: No external GPS antenna or additional wiring to route
- Better Value: Only $16 more than UM385 + GPS receiver purchased separately
IDEAL FOR:
- Sailors and powerboaters who want complete DSC safety features without buying separate GPS
- Offshore anglers requiring reliable long-range communication with accurate position reporting
- Coastal cruisers who need GPS-enabled DSC for safe passage making
- Charter boats and small commercial vessels requiring full safety compliance
- Boats without existing GPS wanting an all-in-one communication solution
- Upgrades from older VHF radios seeking modern DSC and GPS capability
TECHNICAL SPECIFICATIONS:
- Power Output: 25 Watts (High) / 1 Watt (Low)
- GPS: 66-channel receiver, built-in
- GPS Accuracy: <10 meters typical
- Channels: All USA, International, and Canadian marine channels
- Waterproof Rating: IPX4/JIS4 (splash resistant)
- NMEA: 0183 Input/Output for chartplotter integration
- DSC: Class D Digital Selective Calling with GPS position
- Weather Channels: 10 NOAA weather channels with S.A.M.E. alerts
- Mounting: Front panel, standard DIN cutout
- Display: Large backlit LCD with multi-level brightness adjustment
- Color: White face with black housing
- Power Supply: 13.8V DC
- Operating Temperature: -20°C to +60°C
WHAT'S INCLUDED:
- UM435 VHF Marine Radio with built-in GPS
- Mounting bracket with installation hardware
- DC power cable with inline fuse holder
- Microphone with coiled cord and hanger bracket
- GPS antenna (internal - no external antenna required)
- Owner's manual with programming instructions
- Quick start guide for DSC setup
- Warranty registration card
INSTALLATION & SETUP:
The UM435 installs in standard marine radio cutouts, making it a direct replacement for most older VHF radios. The built-in GPS simplifies installation by eliminating the need for an external GPS antenna and receiver. Professional installation is recommended to ensure proper antenna connection, DC power wiring with adequate circuit protection, secure grounding to minimize interference, and correct NMEA connections if integrating with chartplotters.
After installation, the radio requires DSC programming with your vessel's MMSI (Maritime Mobile Service Identity) number. This nine-digit number is obtained free from the FCC (for US vessels) or your country's marine authority and must be programmed into the radio before DSC functions will operate. The process takes about 5 minutes and is detailed in the included manual.
DSC SAFETY FEATURES:
The UM435's Digital Selective Calling capability transforms your VHF radio into a comprehensive safety system. In an emergency, pressing and holding the distress button sends an automated alert on Channel 70 that includes your vessel's identification, precise GPS coordinates, and the nature of your distress. This signal is received by the Coast Guard and all DSC-equipped vessels within range, providing faster rescue response than traditional voice calls on Channel 16.
Beyond distress calling, DSC enables direct vessel-to-vessel calling (like making a phone call on the VHF), position reporting to share your location with other boats, and automated channel switching when calls are received.
WARRANTY & COMPLIANCE:
Meets all FCC Part 80 regulations for marine VHF transceivers and is type-accepted for commercial and recreational use in United States waters. The UM435 complies with international maritime communication standards including GMDSS DSC requirements. Uniden provides a 2-year manufacturer warranty covering defects in materials and workmanship.
Need help with MMSI registration or DSC setup? Visit our Marine Guides for step-by-step tutorials on FCC MMSI registration, DSC programming, and VHF radio installation best practices.
Frequently Asked Questions
Q: What's the main difference between the UM435 and the UM385?
A: The UM435 includes a built-in GPS receiver while the UM385 requires an external GPS receiver (Uniden MRN-GPSK, sold separately) for position reporting. The UM435 costs $178.99 versus $162.99 for the UM385. When you factor in the cost of an external GPS receiver (~$100), the UM435 provides better value and simpler installation. Both radios have identical VHF transmission capabilities, DSC functionality, and NMEA connectivity—the only difference is the integrated GPS in the UM435.
Q: Do I need to register for an MMSI number to use this radio?
A: You can use the UM435 for basic VHF voice communication without an MMSI number. However, to activate the DSC emergency and calling features, you must obtain and program an MMSI (Maritime Mobile Service Identity) number. US vessels get MMSI numbers free from the FCC at www.fcc.gov or from BoatUS for recreational vessels. The registration process takes about 10 minutes online, and you'll receive your 9-digit MMSI immediately. Without MMSI programming, the distress button and DSC calling features will not function.
Q: How good is the built-in GPS compared to a dedicated marine GPS unit?
A: The UM435's 66-channel GPS receiver provides position accuracy within 10 meters, which is sufficient for DSC distress calling and position reporting. However, it's not a replacement for a dedicated chartplotter or GPS navigator. The GPS serves one primary purpose: automatically including your coordinates in DSC emergency transmissions. The radio's display shows basic position data (latitude/longitude), but lacks navigation features like waypoints, routes, or maps. For navigation, you'll still want a dedicated GPS or chartplotter that can receive position data from the UM435 via NMEA connection.
Q: Will the GPS work if the radio is mounted inside the cabin?
A: GPS performance is best when the radio has a clear view of the sky. Mounting inside an enclosed cabin, particularly under a metal hardtop or radar arch, may significantly reduce GPS signal reception. For optimal GPS performance, mount the UM435 at the helm where it has exposure to the sky, or in a location with minimal overhead obstruction. If you must mount in an enclosed space, the radio may take longer to acquire satellites or may not achieve a reliable GPS fix. In such cases, the UM385 with an external GPS antenna (which can be mounted outside) might be a better choice.
Q: Can I connect this radio to my existing chartplotter?
A: Yes, the UM435 features NMEA 0183 input and output connections that allow bidirectional communication with chartplotters and other marine electronics. The radio can receive position data from your chartplotter (if you prefer to use that GPS instead of the built-in one) and can send its GPS position to your chartplotter for display. This integration allows your chartplotter to show DSC calls, display caller positions on the chart, and log radio communications. Connection requires compatible NMEA 0183 wiring, which is typically handled during professional installation.
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