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Uniden UM725GBT Marine VHF Radio Owner Manual

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Uniden UM725GBT Marine VHF Radio

UM725GBT Marine VHF Radio


Lift the red cover. Press and hold the DISTRESS key for three seconds. Your radio transmits your ship’s location every few minutes until you receive a response.

If the radio displays Enter User MMSI, cancel the automatic distress call and make a normal voice distress call.

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  1. Make sure your radio is on.
  2. Press the 16/P key to switch to Channel 16 (156.8 MHz). (If the corner of the display does not show 16, press the 16/P key again until it does.)
  3. Press the PUSH-TO-TALK key and say: “MAYDAY — MAYDAY — MAYDAY.”
  4. Say “THIS IS {name of your ship (three times)} and call sign/ship registration number (once).”
  5. Repeat “MAYDAY {name of your ship}” once.
  6. Tell where you are: (what navigational aids or landmarks are near, or read the latitude and longitude from your GPS).
  7. State the nature of your distress (e.g. are you sinking, medical emergency, man overboard, on fire, adrift, etc. ).
  8. State the type of assistance you need (medical, towing, pumps, etc.).
  9. Give several persons aboard and the conditions of any injured persons.
  10. Estimate the present seaworthiness of your ship (e.g. how immediate is the danger due to flooding or fire or proximity to shore).
  11. Briefly describe your ship, giving the ship name (e.g. “Blue Duck is a 32-foot cabin cruiser, white hull, blue deck house”).
  13.  End the message by saying “THIS IS {name or call sign of your ship}, OVER.”
  14. Release the PUSH-TO-TALK key and listen.


  • UM725GBT: NMEA2000 Compatible VHF Marine Radio with GPS and Bluetooth – Class  D DSC radio with integrated GPS and Bluetooth, so you can use Uniden’s smartphone app (iOS and Android) to set up the radio and text message other VHF text message capable radios.
  • UM725G: NMEA2000 Compatible VHF Marine Radio with GPS – Class D DSC radio with integrated GPS receiver.
  • UM725: VHF Marine Radio – Class D DSC radio

Your radio provides the following key features:

  • DSC. Provides communication to other ships or groups using their unique identification code. This radio includes a second Class D Receiver to Monitor only DSC watch channel 16 (dedicated) to ensure that no incoming messages are missed.
  • GPS (Favorite Position mode). Saves your current position or lets you manually enter other positions. Provides a directory to save positions for return as desired. Provides a list of saved waypoints and routes that you can save and use to navigate.
  • NMEA2000 Compatibility (UM725GBT/UM725G). Provides a connection to a chart plotter and, through menus, determines what NMEA data you want to receive.
  • Compass Display. Programmable to display your course – by showing your course and direction or by showing location on a north-south-east-west display. Automatically  auto-plots to a received DSC distress call
  • MOB (Man Overboard). Locks onto the current position in Man Overboard situations.
  • National Oceanic and Atmospheric Administration (NOAA) Weather Channel watch. Alerts you when an alert is issued, on 10 available weather channels.
  • Memory Scan. Monitors saved channels in quick succession. All marine VHF channels for the U.S., Canada, and international waters
  • Dual- Triple-Watch. Monitors Coast Guard distress, hailing, or priority channels and one weather channel along with one regular marine channel.
  • Emergency Channel (16) Monitoring. Check this emergency channel while scanning.


UM725GBT Marine VHF Radio 2

Some of the images in this manual may vary slightly from the actual product. If any pieces are missing or damaged, contact Customer Service at uniden.



The included mounting bracket allows your radio to sit at any angle to accommodate the best location. Select a location that can:

  • Properly support the weight of the radio. You may need some type of anchor with
    mounting screws, depending on the surface.
  • Keep the battery leads as short as possible.
  • Keep the antenna lead-in wire as short as possible.
  • Allow free airflow around the heat sink on the rear of the radio.
  • Avoid interference with the ship’s compass.

To extend the life of the radio, use the waterproofer’s instructions. Attach a rubber cap to the unused connector.


  1. Slide the radio into the mounting bracket and tighten the mounting knobs to secure the radio in place.
  2. Position the radio into the desired location and mark the edges of the bracket on the mounting surface.
  3. Remove the mounting bracket drill template from the back of the manual, and use the template to mark the drill holes on the mounting surface.
  4. Drill the holes for the mounting bracket; be sure to follow any special requirements of the mounting  surface
  5. Remove the bracket from the radio and use the mounting hardware to secure the bracket to the mounting surface.
  6. Install the radio back into the mounting bracket.

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  1. Slide the radio into the surface opening.
  2. Align the mounting brackets with the screw holes on the radio as indicated.
  3. Insert and tighten the screws to secure the radio in place. The pads of the mounting brackets should press firmly against the interior of the mounting surface.

UM725GBT Marine VHF Radio 4

To operate correctly, your radio requires a power source and an antenna. Additionally, you can connect your radio to an external GPS antenna, chartplotter, and/or a remote microphone (Model UMRMIC, optional, sold separately).

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  1. Connect your boat’s power supply using the black and red power connector.
  2. Connect your radio antenna’s PL-259 connector to the radio’s ANT port.
  3. You can connect your radio to your boat’s navigation system using one of the following connectors.
  • External GPS Antenna (UM725GBT/UM725G only)
  • NMEA2000 (UM725GBT/UM725G only)
  • Accessory Connector (NMEA0183)

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UM725GBT Marine VHF Radio 7

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Your UM725 VHF Maritime Radio is designed to provide quick and easy access to critical functions and cool features. For most operations, the UM725 uses a 3-part operating structure: Physical Controls, Menus, and Soft Keys.

  • Physical Controls – Use the radio’s buttons and knobs to access and navigate various menu settings and functions.
  • Menus – Press the MENU button to access various menu settings and functions.
  • Soft Keys – Use the dynamic Soft Key and scroll buttons to access features and make selections based on the current screen.

UM725GBT Marine VHF Radio 9


When you power up your radio for the first time, MMSI Not Entered appears, followed by a Marine mode screen. To use DSC features, you must be assigned an individual User MMSI number and program that number into your radio. User MMSI numbers are unique and cannot be entered more than once.  If you choose to not enter your specific MMSI number at the initial start-up, you can still use many of your radio’s features. However, some radio functions will be impacted, and you will not be able to use any DSC features.

You can get more information on MMSI numbers at these resources:

  • The dealer where you purchased the radio
  • Recreational boaters can obtain an individual MMSI number from the Boat Owner’s Association of the U.S. (BoatUS or call 800-563-1536) or SeaTow Services International  https://seatow.com/
  • Commercial boaters need a ship station license to get an MMSI number. For more information, visit the Federal Communications Commission (FCC) website at http:// wireless.fcc.gov/marine/ fctsht14.html.

Before you begin this process, have your MMSI number available and familiarize yourself with the menu navigation on Page 10. Be sure you have the correct User MMSI number before entering it in the radio. The radio only allows you to enter the User MMSI once. If you need to re-enter the User MMSI number, visit support uniden for assistance.


  1. Press and hold the button until the unit turns on. An ATTENTION message appears.
  2. Press the PROG soft key. The ENTER MMSI screen appears.
  3. Use the PUSH/SELECT knob to enter each digit of your MMSI number.
  4. Press the SAVE Soft Key to save the MMSI number.

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Your radio screen shows a different combination of icons and information depending on the current operation, each designed to provide information intuitively.

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Your UM725 VHF Radio is designed to be dynamic and flexible to provide many features. Therefore screens can vary depending on your unique settings. The screen below shows some commonly used screens that you may encounter.

Menu Screens

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Various menus let you access radio settings and functions using a combination of controls,  such as the PUSH/SELECT knob, CH ▲▼ buttons, or dynamic soft key options that appear.

Keyboard Screens

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Keyboard screens appear when a setting requires a text entry. Use the PUSH/ SELECT knob, CH ▲▼ buttons, and dynamic soft key options that appear with the keyboards to enter text.

Compass Screen

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The compass screen appears when you press the COMP soft key. Its appearance may vary depending on your unique radio settings.

Various menus let you access settings for your radio and various functions of your radio. You can navigate these menus using a combination of controls. Press the MENU button to access the radio’s main menu. Turn the PUSH/SELECT knob to select a menu item, then press the knob to open that menu.

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Your UM725 VHF Radio is designed to provide flexibility in its controls. You can navigate menus using several methods: the PUSH/SELECT knob, CH/buttons, and dynamic soft key options that appear. Familiarize yourself with how various navigation options work to find what works best for you. This will make navigation easier.

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Soft keys offer quick access to many radio functions, using only the three buttons immediately beneath the screen and the two scroll buttons.

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Even though you can change your radio’s settings at any time, as needed, you will probably want to establish initial settings when you turn it on for the first time. Below are some basic settings that are recommended for initial setup.


  1. Press the MENU button, then turn the PUSH/ SEL knob to select GENERAL SETUP. Press the PUSH/SEL knob, and the GENERAL SETUP submenu appears.UM725GBT Marine VHF Radio 20
  2. From here, you can use the PUSH/SEL knob and ▲ or ▼ buttons to access and customize general  settings for your radio:UM725GBT Marine VHF Radio 21
  • BACKLIGHT LEVEL – brightness, Off – 8.
  • BACKLIGHT COLOR – White or amber.
  • CONTRAST/RVS – contrast levels Off – 7, or invert the colors.
  • KEY BEEP – Off – 7.
  • INACTIVITY TIMER – When inactive for 1, 2, 3,  5, 8, or 10 minutes, the radio returns to the main screen.
  • KEY ASSIGNMENT – Let you reorder the soft key functions.

Your radio supports access via remote mic (UMRMIC Optional). The REMOTE MIC SETUP menu appears only when a remote mic is connected.

  1. Connect the Remote Menu to the Remote Mic Connector, marked RM, on your radio.
  2. Press the MENU button on your radio and then use the PUSH/SEL knob to access the REMOTE MIC SETUP menu.UM725GBT Marine VHF Radio 22
  3. From here, you can use the PUSH/SEL knob and ▲ or ▼ buttons to access and customize general settings for your radio:
  • BACKLIGHT LEVEL – brightness, Off – 8.
  • BACKLIGHT COLOR – White or amber.
  • CONTRAST/RVS – contrast levels 1 – 20, or invert the colors.
  • KEY BEEP – Off – 7.


To customize your radio to your specific needs, it is important to understand its basic operation. Your radio has three main operation modes:

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Digital Selective Calling (DSC) is a standard that allows you to quickly and easily call specific radios or groups of radios using their unique MMSI (Maritime Mobile Service Identity) number. The four basic call types are:

  • Distress Calls – Use in emergencies only! The Distress message alerts all ships that you need assistance and sends your current position.
  • Individual Calls – Calls a single station using the User MMSI. Use when you want to talk to another station
  • Group Calls – Calls all ships with the same Group MMSI. Use it to talk with your whole group at the same time.
  • All Ships Calls – Calls all ships within range of your radio. Should.

The DSC standard dedicates a VHF channel—channel 70—to digital transmissions only. Because digital transmissions require less bandwidth than voice transmissions, channel 70 avoids the problems of busy voice channels. The radio uses channel 70 to transmit your MMSI number to the other station along with a voice channel. If the other station accepts your call, both radios automatically switch to the requested voice channel so you can talk to the other station.

DSC also provides a system for automated distress calls. At the touch of a key, the radio can transmit your MMSI number, the nature of your distress, and your current position based on data from your GPS receiver. The radio repeats the distress call every few minutes until it receives an acknowledgment. Much like familiar “contacts” and “group text” functions of modern phones, your UM725 lets you save individual contacts in your Individual Directory and groups in your Group Directory.

Suppose you are coordinating safety for a sailboat race. Before the race starts, you instruct all the racers to enter your group MMSI number into their radios. During the race:

  • Throughout the race, you use group calling to update the racers on the time, race status, and any course corrections.
  • A powerboat full of spectators comes too close to the race path. You use individual calling to contact the power boat and advise them to stay clear of the race.
  • You see a rowboat entering the area, but since it doesn’t have a radio, you can’t communicate with the rowboat. You use all ships calling to alert all the other ships in the area of the possible danger.

Automatic acknowledgment automatically transmits your current position in response to position requests. Most boaters activate automatic position replies for safety reasons or because they subscribe to a marine towing service. Sometimes—for example, in some competitive situations—you may not want other ships to get your position without your manual confirmation.

Much like traditional contacts in a phone, DSC directories let you store up to 100 individual MMSI numbers of other ships and 50 group MMSI numbers. From the directories, you can add, edit, or delete MMSI numbers.


Unlike the user MMSI number, you can create a group MMSI number yourself, and You can also change the group MMSI number as often as you want. You don’t have to get a group MMSI number from a specific organization. For example, if you are part of a boating club,

To modify an existing group, press EDIT in Step 3 and select the group name from the list that appears. To delete a group from your directory, select DELETE, select the group, and then confirm.


You can search the internet for latitude and longitude for the location you want. For example, search for “Key West Naval Hospital coordinates.” You can save up to 250 waypoints in your Waypoint Directory. You can also use the position stored in MK POS and MOB.

The Waypoint selected for the 01 position will be the first point to which your radio will navigate. When you reach that waypoint, the radio will navigate to the next waypoint (02), and continue through the list of waypoints.


NMEA DATA OUTPUT(UM725GBT/UM725G Models only. – Designates the port for NMEA data output.NMEA0183 OUTPUT- Select the NMEA sentence to send.  NMEA0183 Data speed To set which NMEA data output speed to use (4800pbs or38400pbs)

If your NMEA device does not initially receive data from your radio, check the accessory cable connection, parameters on the NMEA0183 DATA OUTPUT, and NMEADATA SPEED. (UM725GBT/UM725G Models Only)Make sure that NMEA0183 is ON in the POS DATA OUTPUT menu.


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Warning! This transmitter will operate on channels/frequencies that have restricted use in the United States. The channel assignments include frequencies assigned for exclusive use of the U.S. Coast Guard, use in Canada, and use in international waters. Operation on these frequencies without proper authorization is strictly forbidden. See page E-47 for tables of the available channels and their uses. If you are still not certain which channels to use, see the FCC maritime radio page at the FCC website (http://wireless.fcc.gov/marine/) or contact the FCC Call Center at 1-888-CALL-FCC. For individuals requiring a license, such as commercial users, you should obtain a license application from your nearest FCC field office (for US users) or Industry Canada (for Canadian users). MARITIME RADIO SERVICES OPERATION  Warning! This transmitter will operate on channels/frequencies that have restricted use in the United States.

The channel assignments include frequencies assigned for exclusive use of the U.S. Coast Guard, use in Canada, and use in international waters. Operation on these frequencies without proper authorization is strictly forbidden. See page E-47 for tables of the available channels and their uses. If you are still not certain which channels to use, see the FCC maritime radio page at the FCC website (http://wireless.fcc.gov/ marine/) or contact the FCC Call Center at 1-888-CALL-FCC. For individuals requiring a license, such as commercial users, you should obtain a license application from your nearest FCC field office (for US users) or Industry Canada (for Canadian users).

You should familiarize yourself with the rules on marine radios and be aware of which rules apply to your ship. Complete guidelines for all ship and marine radio types can be found at the US Coast Guard website under the topic Radio Info for Boaters (the direct link is http://www.navcen.uscg.gov/?pageName=mtBoater. Here are a few guidelines that affect nearly all boaters.

  • If you have a VHF radio on your ship, you must maintain a watch on channel 16 (156.800 MHz) whenever the radio is not being used to communicate. Starting in 2004, if a radio is carried, it must be on and set to channel 16 whenever your ship is underway.
  • If you hear a distress call, wait a few minutes to let a shore station or Coast Guard ship respond. If no other station has responded after 5 minutes, you must respond to the distress call.
  • Do not make false mayday or distress calls as a prank or to test your radio. (This is essentially like making a false 9-1-1 call; you may be subject to fines.)

FCC/Industry Canada Information
Output Power: Hi 25W / Lo 1W Transmitter Frequency Range: 156.025-161.600MHz This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. Unauthorized changes or modifications to this equipment may void compliance with the FCC Rules. Any change or modification must be approved in writing by Uniden. Changes or modifications not approved by Uniden could void the user’s authority to operate the equipment.

FCC RF Exposure Information
In August 1996 the Federal Communications Commission (FCC) of the United States with its action in Report and Order FCC 96-326 adopted an updated safety standard for human exposure to radio frequency electromagnetic energy emitted by FCC-regulated transmitters. Those guidelines are consistent with the safety standards previously set by both U.S. and international standards bodies. The design of the radio complies with the FCC guidelines and these international standards. Never allow children to operate the radio without adult supervision and the knowledge of the following guidelines.

It is up to the user to properly operate this radio transmitter to ensure safe operation. Please adhere to the following: Use only the supplied or an approved antenna. Unauthorized antennas, modifications, or attachments could impair call quality, damage the radio, or violate FCC regulations.  Do not use the radio with a damaged antenna. If a damaged antenna comes into contact with the skin, a minor burn may result.

Please contact your local dealer for a replacement antenna maintain compliance with FCC RF exposure requirements, the radio must be used with a maximum duty cycle not exceeding 50% in a typical push-to-talk radio use time. DO NOT transmit for more than 50% of total radio use time.


FCC Part 15
The equipment has been tested and found to comply with the limits for a Class B device, under Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used by the instructions, may cause harmful interference to radio communications.

However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and the receiver
  • Connect the equipment to an outlet on a circuit different from that to which the  receiver is connected
  • Consult the dealer or an experienced radio/TV technician for help.

Changes or modifications not expressly approved by the party responsible for compliance could void your authority to operate the equipment. Any change or modification must be approved in writing by Uniden.  This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with a minimum distance of 130cm between the radiator & your body. This transmitter must not be co-located or operating in conjunction with any other antenna or transmitter.

This device contains license-exempt transmitter(s)/receiver(s) that comply with Innovation, Science, and Economic Development Canada’s license-exempt RSS(s). Operation is subject to the following two conditions:

The device meets the exemption from the routine evaluation limits in section 2.5 of RSS 102 and compliance with RSS-102 RF exposure, users can obtain Canadian information on RF exposure and compliance.


WARRANTOR: UNIDEN AMERICA CORP. (“Uniden”) ELEMENTS OF WARRANTY: Uniden warrants, for three years, to the original retail owner, this Uniden Product to be free from defects in materials and craftsmanship with only the limitations or exclusions set out below. WARRANTY DURATION: This warranty to the original user shall terminate and be of no further effect 36 months after the date of the original retail sale.

The warranty is invalid if the Product is (A) damaged or not maintained as reasonable or necessary, (B) modified, altered, or used as part of any conversion kits, subassemblies, or any configurations not sold by Uniden, (C) improperly installed, (D) serviced or repaired by someone other than an authorized Uniden service center for a defect or malfunction covered by this warranty, (E) used in any conjunction with equipment or parts or as part of any system not manufacturedby Uniden, or (F) installed or programmed by anyone other than as detailed by the Operating Guide for this product.  STATEMENT OF REMEDY:

If the product does not conform to this warranty at any time while this warranty is in effect, the warrantor will repair the defect and return it to you without charge for parts, service, or any other cost (except shipping and handling) incurred by the warrantor or its representatives in connection with the performance of this warranty. THE LIMITED WARRANTY SET FORTH ABOVE IS THE SOLE AND ENTIRE WARRANTY ABOUT THE PRODUCT AND IS INSTEAD OF AND EXCLUDES ALL OTHER WARRANTIES OF ANY NATURE WHATSOEVER, WHETHER EXPRESS, IMPLIED, OR ARISING BY OPERATION OF LAW, INCLUDING, BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. THIS WARRANTY DOES NOT COVER OR PROVIDE FOR THE REIMBURSEMENT OR PAYMENT OF INCIDENTAL OR CONSEQUENTIAL DAMAGES.

Some states do not allow this exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you. LEGAL REMEDIES: This warranty gives you specific legal rights, and you may also have other rights that vary from state to state. This warranty is void outside the United States of America.

PROCEDURE FOR OBTAINING PERFORMANCE OF WARRANTY: If, after following the instructions in this Operating Guide you are certain that the Product is defective, pack the Product carefully (preferably in its original packaging). Include evidence of other original purchases and a note describing the defect that has caused you to return it. The Product should be shipped freight prepaid, by traceable means, or delivered, to the warrantor at:

  • Uniden America Corporation
  • C/O Saddle Creek
  • 743 Henrietta Creek Rd., Suite 100
  • Roanoke, TX, 76262

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FAQS About Uniden UM725GBT Marine VHF Radio

What is the range of the Uniden UM725GBT Marine VHF Radio?

The Uniden UM725GBT typically has a range of up to 25 miles, but the actual range can vary depending on factors such as weather conditions and terrain.

Is the Uniden UM725GBT waterproof?

Yes, the Uniden UM725GBT Marine VHF Radio is designed to be waterproof and submersible, meeting the IPX7 standard.

What channels does the Uniden UM725GBT support?

The Uniden UM725GBT Marine VHF Radio supports all USA, Canadian, and international marine channels, including NOAA weather channels.

Does the Uniden UM725GBT have a built-in GPS?

Yes, the Uniden UM725GBT features built-in GPS with DSC (Digital Selective Calling) capabilities, allowing you to send distress signals with your exact location in case of emergency.

Can I connect an external GPS antenna to the Uniden UM725GBT?

Yes, the Uniden UM725GBT has a GPS input for connecting an external GPS antenna for improved accuracy and signal reception.

Is the Uniden UM725GBT easy to install?

Yes, the Uniden UM725GBT Marine VHF Radio is designed for easy installation, with straightforward wiring and mounting options.

What is the power output of the Uniden UM725GBT?

The Uniden UM725GBT typically has a power output of 25 watts for transmitting, providing reliable communication over long distances.

Does the Uniden UM725GBT have a distress call button?

Yes, the Uniden UM725GBT features a dedicated distress call button, allowing you to quickly send distress signals to nearby vessels and authorities.

Can I connect a remote microphone to the Uniden UM725GBT?

Yes, the Uniden UM725GBT supports the use of remote microphones for convenient communication from different locations on your vessel.

What is included in the box when purchasing the Uniden UM725GBT?

The Uniden UM725GBT Marine VHF Radio typically comes with the radio unit, a mounting bracket, a microphone, a power cord, and documentation including a user manual. Additional accessories may vary depending on the retailer and package.

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