1. Introduction
Thank you for purchasing the Icom M510 VHF Fixed Mount Radio. This manual provides essential information for the proper installation, operation, and maintenance of your device. Please read this manual thoroughly before using the M510 to ensure safe and optimal performance. The Icom M510 is a Class D DSC fixed mount VHF marine transceiver designed for reliable communication on the water.
The M510 features a 3.5-inch TFT LCD display, offering clear visibility with wide viewing angles. It supports advanced functionalities including wireless control via smart devices and NMEA 2000 connectivity with optional accessories.
2. Safety Information
Important Safety Instructions:
- Do not operate the radio in explosive atmospheres.
- Ensure proper power supply (13.8V DC, 11.7–15.9V DC) to prevent damage.
- Avoid exposing the radio to direct sunlight for extended periods.
- Keep the radio away from strong electromagnetic fields.
- Refer all servicing to qualified Icom technicians.
- Always disconnect power before performing any installation or maintenance.
3. Package Contents
Verify that all items are present in the package:
- Icom M510 VHF Radio Unit
- Speaker Microphone (HM-250RB)
- DC Power Cable
- Microphone Hanger
- Mounting Bracket Kit
- Instruction Manual (this document)

Image 1: Icom M510 VHF Fixed Mount Radio and HM-250RB Speaker Microphone.
4. Setup and Installation
4.1 Mounting the Radio
The M510 is designed for fixed mounting. Use the provided mounting bracket kit to secure the radio in a suitable location on your vessel. Ensure the location allows for proper ventilation and easy access to controls and connections. The compact depth of the M510 allows for installation in more confined spaces compared to previous models.
4.2 Power Connection
Connect the supplied DC power cable to a 13.8V DC power source (operating range 11.7V to 15.9V DC). Observe correct polarity: red wire to positive (+), black wire to negative (-). Improper connection can damage the unit.
4.3 Antenna Connection
Connect a suitable VHF marine antenna to the antenna connector on the rear of the M510. Ensure the connection is secure and waterproof.
4.4 Microphone Connection
The HM-250RB speaker microphone can be connected to either the front or back microphone connection ports on the M510. Choose the port that offers the most convenient access for your setup.
4.5 Optional Connections
- External Speaker: An external speaker can be connected for enhanced audio output.
- External GPS: The M510 supports connection to an external GPS receiver for position data.
- NMEA 2000: For NMEA 2000 connectivity, use the optional CT-M500 wireless interface box. This allows flexible placement of the NMEA connection.
- Voice Scrambler: An optional voice scrambler can be connected for secure communications.
5. Operating Instructions
5.1 Power On/Off
Press and hold the CH/ENT PWR button to power the unit on or off.
5.2 Volume and Squelch Adjustment
- Volume (VOL): Rotate the VOL knob to adjust the audio output level.
- Squelch (SQL): Rotate the SQL knob to adjust the squelch level. Adjust until background noise disappears, but weak signals can still be heard.
5.3 Channel Selection
Use the CH up/down buttons or the rotary selector to change channels. The M510 supports USA, International (INT), Canadian (CAN), and Weather (WX) channels, as well as 4-digit channels.
5.4 Transmitting
To transmit, press and hold the Push-To-Talk (PTT) button on the microphone. Speak clearly into the microphone. Release the PTT button to receive.
5.5 Display and Menu Navigation
The 3.5-inch TFT LCD screen provides a clear user interface. Use the MENU button to access various settings and functions. Navigate using the directional buttons and confirm selections with ENT.
The display features animated functions and a night mode for optimal viewing in low-light conditions.
5.6 Digital Selective Calling (DSC)
The M510 is a Class D DSC radio. For DSC functions, ensure your MMSI (Maritime Mobile Service Identity) is programmed into the radio. Refer to the specific DSC section of the full manual for detailed instructions on making distress calls, individual calls, and other DSC operations.
5.7 Smart Device Connectivity (RS-M500 App)
The RS-M500 app allows up to three iOS® or Android™ smart devices to function as a wireless command speaker/microphone. This enables features such as push-to-talk, channel scrolling/scanning, and intercom functionality from a remote location. One COMMANDMIC™ can also be connected simultaneously with three smart devices.
6. Maintenance
6.1 Cleaning
Wipe the radio and microphone with a soft, damp cloth. Do not use abrasive cleaners or solvents, as they may damage the surfaces. The M510 is water resistant (IP68 rating), but avoid submerging it unnecessarily.
6.2 AquaQuake™ Function
The HM-250RB microphone features AquaQuake™. This function vibrates the speaker diaphragm to shed water, ensuring clear audio even after exposure to moisture. Activate it periodically or after the microphone has been wet.
6.3 Firmware Updates
Periodically check the Icom website for firmware updates to ensure your M510 has the latest features and performance enhancements.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable disconnected or fuse blown. | Check power cable connections. Inspect and replace fuse if necessary. |
| No audio from speaker | Volume too low, squelch too high, or speaker damaged. | Increase volume. Decrease squelch. Check external speaker connection if used. |
| Cannot transmit | Antenna not connected, PTT button faulty, or power output setting incorrect. | Ensure antenna is securely connected. Check PTT button. Verify power output setting. |
| Poor reception | Antenna issue, interference, or squelch too high. | Check antenna connection and condition. Move away from sources of interference. Adjust squelch. |
If the problem persists after attempting these solutions, please contact Icom customer support or a qualified service technician.
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | M510 |
| Usable Channels | USA, INT, CAN, WX channels |
| Type of Emission | 16K0G3E (FM), 16K0G2B (DSC), 16K0GXW (AIS)* |
| Power Supply Requirement | 13.8V DC (11.7–15.9V DC) |
| Current Drain TX (25W output) | 5.0A |
| Current Drain RX (Max. Audio) | 3.3A |
| Operating Temperature Range | –20°C to +60°C (–4°F to +140°F) |
| Frequency Range (Transmit) | 156.025 to 157.425 MHz |
| Frequency Range (Receive) | 156.050 to 163.275 MHz |
| Talking Range Maximum | 5.6 Kilometers (approx. 3 nautical miles) |
| Water Resistance Level | IP68 (Dust-tight and protected against continuous immersion in water) |
| Display | 3.5-inch TFT LCD |
| Weight | Approximately 4.14 pounds (1.88 kg) |
*AIS functionality may require additional components or specific regional configurations.
9. Warranty and Support
Icom products are covered by a limited warranty. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Icom website. Keep your proof of purchase for warranty claims.
For technical support, service, or inquiries, please contact Icom America customer service. Contact information can typically be found on the Icom website or in the product packaging.
Online Resources: For additional information, FAQs, and software downloads, visit the official Icom website: www.icomamerica.com





