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Uniden Atlantis 155 Marine VHF Radio User Manual

Uniden Atlantis 155 Marine VHF Radio featured

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Uniden Atlantis 155 Marine VHF Radio

Uniden Atlantis 155 Marine VHF Radio


About Uniden 
Uniden America Corporation, the North American subsidiary of Japan-based Uniden Corporation, manufactures and markets wireless consumer electronic products including home security and video security systems, Bearcat® scanners, FRS/GMRS radios, marine radios, radar detectors, dash cams, and other wireless personal communications products. Based in Irving, Texas, Uniden sells its products through retailers and distributors throughout North, Central and South America.


WHAT’S INCLUDEDUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-1

CONTROLS AND INDICATORSUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-2

KEY OPERATIONUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-3




The radio connects to power through a single DC adapter.

  1. Connect the DC adapter to the DC 12V jack on the side of the radio.
  2. Plug the other end of the adapter into the cigarette lighter.


Your radio uses the supplied 4 rechargeable AAA NiMH batteries. To install the batteries:

  1. Make sure the radio is off.
  2. Remove the belt clip if necessary.
  3. Use a screwdriver or the screwdriver tip on the belt clip to turn the battery compartment screw counterclockwise and then lift up and remove the battery cover.Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-6
  4. Insert the batteries into the battery compartment.
  5. Before placing the battery cover back on the radio, check the rubber seal around the battery compartment. Make sure that the seal is in good condition and that there is no foreign matter under the seal.
    If the rubber seal appears worn, nicked, or dried out, replace it. Visit www.uniden.com to order a replacement seal.
  6. Replace the battery compartment door. Tighten the screw securely.


Your radio includes a DC adapter for charging. Follow these instructions to recharge the radio.

For the initial battery charge, make sure the radio is off for optimum charging.

  1. Insert the adapter into the cigarette lighter. 
  2. Connect the other end of the adapter to the radio. Make sure that the battery icon animates.
  3. Charge the radio for 13 hours then disconnect it from the adapter.

Battery Level Display

The battery icon at the bottom of the screen indicates the battery level (displayed as one of the following 5 levels) at all times except while charging.Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-7

Battery Life: 10 Hours (Typical)


To attach the belt clip:

Slide the belt clip until it snaps into place.

To remove the belt clip:

Press and hold the belt clip lock down while simultaneously sliding it upward until it releases.


In order to get the most out of your new radio, read this owner’s manual completely before attempting to operate the unit.


Power On/Off

  1. Press and holdUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-8 to turn the radio ON. A channel number and  battery level should appear on the display.
  2. Press and holdUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-8 to turn the radio OFF.


The volume level can be adjusted from 0 (no volume) to 15 (maximum volume).

Press Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-9

to increase or decrease the volume level. The current volume level flashes.Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-13

Select a Channel

Press Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-11

to scroll though the channels individually.

Press and hold Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-11

to scroll rapidly through the channel numbers. 

Set Squelch

Use squelch to eliminate any annoying background noise when there are no signals present.

NOTE: Make sure to first select a channel not in use before setting the squelch.


Think of the squelch control as a gate. If you increase the squelch level to maximum, it raises the “Squelch Gate” so only the strongest signals get through.



If you decrease the squelch level to minimum, it lowers the “Squelch Gate”’ to the extent that weak signals can get through.




If unwanted weak and noisy signals are getting through, increase the squelch level (raise the “Squelch Gate”) to a medium level. Now only medium and strong signals get through.


S1 – minimum squelch
S2 – medium squelch
S3 – maximum/tight squelch

  1. Press SQL UIC. SQL displays and the current squelch level flashes.
  2. Press SQL UIC while the squelch level displays to change the squelch level to the next step (0 – 3, then repeating again from 0).
  3. After 2 seconds the unit exits the squelch setting.


Selecting Channel Modes

The radio uses U.S., Canadian, and International Marine channels (modes). Press and hold SQL UIC to change modes. Each time you press and hold SQL UIC, the mode indicator changes (US – United States; CAN – Canada; INT – International). Refer to page 28 for a list of the available channels and corresponding frequencies.


The radio can transmit for up to 3 minutes. TX displays when transmitting. After 3 minutes of continuous transmission, transmission is canceled and an error tone sounds.
The radio transmits at 1W; press BOOST to transmit at 3W.

Boosting Transmission Power

  1. Hold the radio approximately 2 inches in front of your mouth with the antenna at approximately 45º angle away from your head.
  2. Press BOOST on the side of the radio to change the transmit power from Low (1W) to High (3W). Speak in a clear, normal, conversational voice.
  3. When you have finished speaking, release PTT or BOOST to listen for a response. TX then disappears.
  4. When the channel is clear, press and hold PTT or BOOST to transmit. TX displays again.


Release PTT or BOOST to receive another party’s transmissions to you.


Your radio has three main operation modes: normal, scan, and weather.Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-18

In addition to the three operation modes, your radio provides two different watch modes which you can activate during any operation mode. In the watch modes, the radio briefly checks for activity on a specific channel, then returns to its previous operation.Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-19


  • To transmit, remove the radio from the charger, then press and hold the PTT key. Release the key when you are finished talking. x For the best sound quality, hold the microphone about two inches from your mouth while you’re talking.
  • Press theUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-11key to move up one channel at a time. Press and hold the key to scroll quickly up the channels.
  • Press theUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-12 key to move down one channel at a time.
    Press and hold the key to scroll quickly down the channels.
  • To change the transmit power, press the H/L LOCK key. The transmit power switches to the next transmit power each time you press this key.

Normal mode with Weather Alert WatchUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-20

If you activate Weather Alert Watch while operating in normal mode, the radio checks Monitoring Channel 25 the most recently used weather channel every seven seconds. If it detects a weather or other hazard alert, it will switch to that weather channel. (If you are transmitting or receiving an active transmission, the radio waits until the channel is clear or you finish your transmission before checking the weather channel.)

Normal mode with Triple Watch

If you activate Triple Watch while operating in normal mode, the radio checks channels 9 and 16 every two seconds. The radio will not check channels 9 or 16 while you are actively transmitting; it waits until your transmission is finished and then checks the channels.Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-21


You can save channels into memory and then use scan mode to monitor those channels from lowest to highest. If the radio detects a signal on a channel, it stays on that channel as long as the signal is received; when the signal stops, the radio continues scanning.Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-22

Using the radio in scan mode

  • To activate scan mode, press SCAN MEM.
  • You must have at least two channels in memory to start a scan.
  • To save a channel into memory, select the channel, then press and hold the SCAN MEM key. The MEM icon displays whenever you tune to that channel.
  • To remove a channel from memory, set the radio to that channel, then press and hold the SCAN MEM key. The MEM icon no longer displays.
  • When the radio stays on a channel, press Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-11orUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-12 to leave that channel and resume scanning.
  • To end the scan, press the SCAN MEM key again; the radio remains on the last scanned channel.

Scan mode with Weather Alert Watch

If you activate Weather Alert Watch while in scan mode (press and hold WX ALERT), the radio checks the most recently-used weather channel every seven seconds, then continues  scanning the next channel in memory:Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-23

Scan mode with Triple Watch

If you activate Triple Watch (press and hold 16/9 TRI) while operating in scan mode, the radio checks channels 9 and 16 every two seconds, then goes on to scan the next channel:Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-24


The NOAA weather channels cooperate with the FCC to alert you of other hazards besides weather (child abduction alerts, nuclear, biological, etc.). In weather mode, the radio monitors one of the nine NOAA weather channels. If any type of alert is received, the radio sounds an alert tone and the display blinks.

Using the radio in weather mode

  • You cannot transmit while in weather mode.
  • To enter weather mode, press the WX ALERT key.
  • If the radio setects a WX Alert signal, it sounds an alert tone 3 times.
  • To turn off the radio’s alert tone, press any key.
  • To cancel weather mode and return to the previous marine channel including emergency channels 16 and 9, press the WX ALERT key again. 

Weather mode with Weather Alert Watch

Because weather mode already monitors the weather channels, you don’t need Weather Alert Watch to check the weather channel every seven seconds. If you activate Weather Alert Watch while operating in weather mode, it operates as a type of “sleep” mode; the radio stays on the weather channel and mutes the speaker. If an alert is detected, the radio sounds an alert tone and turns the speaker back on. This mode is very useful when you are anchoring for the night but want to keep informed of hazards.

Weather mode with Triple WatchUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-25

If you activate Triple Watch while operating in weather mode, the radio checks the current marine channel, channels 9 and 16 every two seconds,
and the current WX channel about every nine seconds.

Emergency Channel 16/9Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-26

Triple Watch

Triple Watch mode monitors channels 16 and 9 for a signal while you listen to the currently-selected channel. The marine radio checks channel 16 and 9 for activity every 2 seconds.

  1. Press and hold 16/9 TRI to activate Triple Watch. TRI displays.
  2. Press and hold 16/9 TRI again to exit Triple Watch. TRI disappears.


While scanning, the radio stops on channels when it receives a signal. When the received signal is over, there is a drop-out delay of 2 seconds for the return of the signal. After 2 seconds, if the signal does not return, the radio resumes scanning.


This feature extends the battery life by switching the receiver circuit power on and off. Battery Save automatically activates during standby mode (RX mode without signal).


The Liquid Crystal Display (LCD) is backlit for easy viewing at night or in low light situations. Backlighting automatically switches on every time a key is pressed (except PTT and BOOST) and off 10 seconds after the last key is pressed.

  1. Press the Backlight icon ( ) and the current backlight  level/color displays.
  2. Press the icon again and the backlight level/color changes in the following order:
    White High (default) – White Medium – White Low – Amber High – Amber Medium – Amber Low – White High, etc.


Adjust the LCD contrast to make the images on the LCD clearer and easier to see. You must first enter LCD contrast adjustment mode.

  1. Turn off the radio, and then turn it on again while pressing and holding 16/9 TRI and WX ALERT.
  2. Press VOL and VOL to change the levels (0 – 31). The contrast level displays and blinks.


To prevent accidental entries, you can lock the keypad. Press and hold H/L LOCK until it beeps to activate Keypad Lock. LOCK displays on the LCD. When Keypad Lock is active, a warning beep sounds and LOCK blinks if you try to press any keys other than PTT, BOOST, or power.

The radio retains Keypad Lock status even when you cycle power on/off. To unlock the keypad, press and hold H/L LOCK again. LOCK disappears.


Key Beep is the tone that sounds when you press a key. To turn Key Beep on or off, press and hold the CH or CH key while turning the radio on.

When Key Beep is on, all key beeps are enabled. When Key Beep is off, all key beeps are disabled except WX Alert Tone.


If the radio falls overboard into the water, you can trigger a tone to help remove water through the speaker. This tone vibrates the speaker and helps push water out the drain hole and speaker openings. 

  1. Press both VOL and VOL to activate this feature. The speaker vibrates and a tone sounds.
  2. Press any key to turn off the tone.


Due to its rugged design, your radio requires very little maintenance. However, it is a precision electronic instrument, so you should follow a few precautions:

  • If the antenna has been damaged, do not transmit except in an emergency situation. Transmitting with a defective antenna may cause further radio damage.
  • You are responsible for continued FCC technical compliance of your radio.
  • You should arrange for periodic performance checks with your Uniden dealer.

COMMON QUESTIONSUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-28



MARINE RADIO CHANNEL CHARTUniden-Atlantis-155-Marine-VHF-Radio-User-Manual-32


* = New Channel, Continuous Marine Broadcast (CMB) Service

Weather Channels and Frequencies (US and CAN)Uniden-Atlantis-155-Marine-VHF-Radio-User-Manual-37


WARNING! Read this information before using the radio.

RBRC Information

As part of our commitment to protect the environment and conserve natural resources, Uniden voluntarily participates in an RBRC® industry program to collect and recycle used Ni-MH batteries within the US.

Please call 1-800-8-BATTERY for information on Ni-MH battery recycling in your area. (RBRC® is a registered trademark of the Rechargeable Battery Recycling Corporation.)


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 28 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 boat. 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/marcomms/boater.htm). Here are a few guidelines that affect nearly all boaters:

  • If you have a VHF radio on your boat, 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 boat is underway.
  • If you hear a distress call, wait a few minutes to let a shore station or Coast Guard vessel 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/IC Information

  • Certification: FCC Part 15 or I.C. RSS
  • Output Power: 3W
  • Emission: 16K0F3E
  • Transmitter Frequency Range: 156.05 ~161.6 MHz

This device complies with Industry Canada licence-exempt RSS standard(s). 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.

Unauthorized changes or modifications to this equipment may void compliance with I.C. 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.

FAQs about Uniden Atlantis 155 Marine VHF Radio

Can a VHF radio function without an antenna?

Any marine VHF radio must have a suitable antenna to operate properly.

What is a marine VHF radio system’s communication range maximum?

The greatest distance between aerials mounted on tall ships and hills is around 60 nautical miles (111 km), and the maximum distance between aerials mounted on small boats at sea level is 5 nautical miles (9 km; 6 mi). Transmission power ranges between 1 and 25 watts.

A maritime radio has how many channels?

The majority of VHF radios available today offer more than twenty-five functional channels. In addition to U.S. channels, many of the most recent devices on the market also include international and Canadian channels as standard equipment. Your VHF radio’s most crucial channels are 13, 16, 19, 22, and 70.

Does my VHF radio need GPS?

A DSC-VHF radio has to happen to two things in order to function properly. It must be connected to a GPS first, and then an MMSI number must be programmed into the radio. The term “MMSI” (Maritime Mobile Service Identity) refers to the special number given to a specific boat.

How far apart should two VHF antennas be?

What should be the bare minimum distance between VHF antennas? We advise an 80-centimeter minimum separation. (For instance, Simrad advises a 100 cm). Please be aware that the VHF antennas should be set as high as possible, regardless of how far apart they are from one another.

What is the shortest distance that two VHF antennas must be apart?

When placing a VHF or AIS antenna next to another antenna or metal item, how close is too close? The VHF and AIS antennas should be spaced apart by 6 feet both vertically and horizontally, per NMEA recommendations. The majority of manufacturers advise more.

Can VHF radios be used on land?

That is forbidden. Fixed or portable marine VHF radios are not permitted to be operated on land at any time.

Why is a VHF radio antenna’s height important?

The likelihood of objects interfering with the radio signal decreases with the height of the antenna. You might be able to put the antenna on the helm, a mast, or the cabin roof depending on the layout of your boat.

Marine VHF: Is it broad or narrow?

In comparison to older radios, modern VHF Marine Band radios use frequency modulation, which employs less carrier variation. Modern VHF Marine Band radios broadcast 16K0G3E modulation or 16-kHz bandwidth phase modulated telephony. With channel allocations that are 25 kHz wide, this works perfectly.

How is VHF tracking carried out?

Direct or VHF tracking entails following the signal sent by the transmitter to the precise location of the tagged animal using a directional antenna. The antenna is rotated by the operator until the strongest signal is detected.

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