Cobra MRF77B GPS E

Our Most Advanced Marine Radio


Find a dealer

Find a Dealer
For customers residing in the EU and UK, VAT and Duties are included in the displayed price.

The MRF77B GPS E is a unique VHF radio with an integrated GPS receiver and exact location for a true life saving device. Instant emergency channel 16/9, Rewind-Say-Again® feature makes this a complete solution. 

Two Year Warranty

Every Cobra product is warranted against all defects in materials and workmanship for a period of two (2) years from the date of original purchase.

Installment Plans

Purchase your Cobra product now and pay over time. Flexible payment options allow you to make interest-free payments over multiple installments.

Free Delivery

Enjoy free standard Delivery on all orders of 79€ and up. All orders deliver to EU Countries and UK will include VAT and Duties.

Simple Returns & Money Back Guarantee

Not satisfied with your product? All Cobra products purchased factory direct come with a 30-day money back guarantee and an easy return process.

Cobra Advanced Technology

Built-in GPS ensures accurate location when calling for Coast Guard assistance in a time of need. Rewind-Say-Again™ allows you to record and replay the last 20 seconds of a VHF call. Dual All-Terrain Radio™ designed for land and water use.

Nothing Comes Close to a Cobra

When heading out on the water, a fixed-mount VHF radio is vital for communication and safety. With advanced safety features, easy menu navigation.

Built-In GPS Receiver

Simply power on and your VHF radio will instantly know your location for sending signals in moments of distress.


Automatically records the last 20 seconds of VHF calls so you can always play back what you missed.

PA Output

Communicate with boaters around you with a PA function to external speaker.


Fully submersible and waterproof to IPX8 (JIS8) standards.

FCC Compliant

Compliant with the latest FCC Specs for Class-D VHF Radios.

Built-In GPS Receiver

Connect to power and your radio will instantly know your location

LCD Display

The Signal Strength Meter shows incoming signals on the large illuminated LCD display.


Record and replay the last 20 seconds of VHF calls


Designed to IPX8 (JIS8) standards to be fully submersible

PA Output

Public Address output to communicate on an external speaker

FCC Compliant

Compliant with the latest FCC Class-D VHF radio specifications

What’s Included

With your Cobra MRF77 GPS E you’ll receive a transceiver, flush mount kit, surface mount kit, microphone, microphone mount, and GPS interface cable.

  • Cobra MRF77 GPS E
  • Transceiver
  • Flush mount kit
  • Surface mount kit
  • Microphone
  • Microphone mount
  • GPS interface cable

Item # MR F77B GPS E


Weight 2.7 lbs (1.22kg)

Height 3 in. (76.2mm)

Width 6 in. (152.4mm)

Depth 6.25 in. (158.75mm)


Built-In GPS Receiver – Simply connect the radio to power and the radio will know your location.

Rewind-Say-Again®– Replay missed VHF calls. Automatically records the last 20 seconds with a digital voice recorder.

PA Output – PA function for public address to external speaker.

What is the range of my Cobra marine radio?

It is difficult to provide a number, because range will be affected by the following factors:

Transmit power: Higher transmit power gets better range. Transmit powers up to 25 watts are allowed.

Length of the antenna: Short antennas will get shorter range.  Long antennas will get longer range.

Height of the antenna: The higher the antenna is mounted, the better the range.

Antenna tuning: Having a properly tuned antenna will maximize your range. Checking the SWR of the antenna will identify how well your antenna is tuned to the marine band.

Atmospheric conditions: Atmospheric conditions can affect radio propagation. If conditions are just right, there are times when you can transmit 100 miles or more. On other occasions you may be limited to only 10 miles.  Although these extremes occur infrequently, it does serve to illustrate the effects of atmospheric conditions.

Your location: Your location will also influence the range. For example if you are located on an inland waterway where buildings and trees can block your signal, you will get less range than if you where in the middle of the ocean. With a handheld radio your range will vary depending on whether you are inside the cabin (worst range) or standing on the highest portion of the deck (best range).

Battery condition (handheld models):  Low batteries will cause your transmit power to drop, which will reduce your range.

The combination and severity of the above factors will determine your range.

Several of these factors can change on a day-to-day basis. If we were to eliminate all the negative effects, a properly setup mobile radio transmitting 25 watts will communicate as follows:

-A powerboat communicating to another powerboat: approximately 20 miles.

-A powerboat communicating to a well-equipped shore station: approximately 50 miles.

-On a sailboat with the antenna mounted at the top of the mast, communicating to another sailboat: approximately 40 miles.

-On a sailboat with the antenna mounted at the top of the mast, communicating to a well-equipped shore station: approximately 80 miles.

Handheld radios will communicate as follows:

-A 5 watt handheld will communicate approximately 7 miles to another handheld, or approximately 20 miles to a well-equipped shore station

-A 2 watt handheld will communicate approximately 5 miles to another handheld, or approximately 15 miles to a well-equipped shore station

What is DSC (Digital Selective Calling)

Digital Selective Calling (DSC) is a radio technology allowing enhanced distress radio messages to be sent digitally. In addition, a DSC equipped vessel with an MMSI number can make a "private" hailing call to another DSC-equipped vessel. Only the vessel being called will receive the initial contact, but the subsequent conversations will take place on an open, “working” channel, which can be monitored by any VHF equipped vessel within your broadcast range.

What is a Maritime Mobile Service Identity (MMSI)? 

Maritime Mobile Service Identity (MMSI) is a unique 9 digit number that is assigned to a (Digital Selective Calling) DSC radio or an AIS unit. Similar to a cell phone number, your MMSI number is your unique calling number for DSC radios or an AIS unit. The information provided when obtaining a MMSI number is transferred into the U.S. Coast Guard's national distress database for use in emergency situations.

Is there a fee to obtain an MMSI? 

MMSI numbers are free for BoatUS members or $25 for non-members. To obtain a new or change your existing MMSI#, visit:

Why should I register my VHF radio and obtain an MMSI number? 

Your VHF radio is the single most important piece of safety equipment you can have on board your vessel. By using a VHF radio with Digital Select Calling (DSC) capability, you increase your safety dramatically by taking advantage of enhanced communications options. These options link you to other vessels and rescue facilities, providing a strong, modern safety net not offered by mobile phones while in the water. 

Why is it so important to have a DSC radio with built-in GPS and/or the option to connect to an external GPS?

Having a built-in GPS in a emergency, one push of the Distress button, transmits the distress signal containing your MMSI# and location Lat/Lon information to USCG and all other DSC capable receivers within your broadcast range. Should (you) the operator become incapacitated, the radio will continue to send the mayday signal. If your DSC radio does not have a built-in GPS, the Coast Guard urges, in the strongest terms possible, that you take the time to interconnect your DSC-equipped radio to an external GPS. Doing so may save your life in a distress situation! Here is a link to an external GPS available from Cobra

Why join Sea Tow? 

As the official VHF radio of Sea Tow, we recommend it. It is the #1 choice of boaters nationwide for boat towing and expert on-water assistance. Membership offers discounts on fuel, boating supplies, restaurants, and gives you an experienced captain standing by 24/7 in case you need help while out on the water. Joining Sea Tow will help prevent out of pocket expenses and save you valuable time in the event that you do need a tow. 

See more FAQs

Customer Reviews
4.8 Based on 5 Reviews
Write a Review

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
Joseph L.
Rf trainer

Awesome radio would recommend to all

Lynda G.
Returned because we couldn't use

Returned because we couldn't use but have not received refund.

Sandra D.
Gift for our son

He loves it!

Jon L.
Great Radio for the $$$

Purchased this unit as backup for my boat. Liked it so much I ended up buying a second one for my nephew's boat.

Brian K.
Clear speaker

The speaker is much more clear then the other radios I've had. I haven't used the rewind yet, but I'm looking forward to using that. I think I'll miss the channel up/down on the microphone but since I'm always in front of the radio, maybe not. It's good to come back to Cobra again. They were the workhorse for quality radios back in the '70's!