Cobra MRF77 User Manual

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The ability to send your position to another station is an added feature of DSC radios that have
GPS attached. It is handy for rendezvous and rescue situations.
Your CobraMarine VHF radio allows you to choose whether to have the radio automatically
respond to all Position Requests it receives or to alert you to a Position Request and allow
you to choose whether to respond or not — manual reply.
To Set The Position Request Reply Type:
1. Enter the DSC SETUP MENU menu and scroll to
POSITION REPLY with the Up/Down soft keys or the
UP/Down channel buttons.
2. Press the ENTR soft key and observe the current
highlighted setting — AUTO or MANUAL.
3. Use the Up/Down soft keys or the Up/Down channel
buttons to change the setting.
4. Press the ENTR soft key to select the setting and return
to the DSC SETUP MENU.
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The ability of your radio to automatically switch to the requested channel when receiving
an Individual Call. In some cases, automatically switching channels may not be wanted,
especially if the radio is being used for Bridge to Bridge communications in a busy port
or waterway.
Your CobraMarine VHF radio allows you to choose whether to have the radio automatically
Change channels to the requested channel in an Individual Call or not.
To Set The Automatic Channel Switch On or Off:
1. Enter the DSC SETUP MENU menu and scroll to AUTO
CHANNL SWITCH (Automatic Channel Switch) with the Up/
Down soft keys or the UP/Down channel buttons.
2. Press the ENTR soft key and observe the current highlighted
setting — ON or OFF.
3. Use the Up/Down soft keys or the Up/Down channel buttons
to change the setting.
4. Press the ENTR soft key to select the setting and return to
the DSC SETUP MENU.
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The Individual Call Reply feature is used when receiving Individual DSC calls. When receiving a
Individual DSC Call, you may not want the radio to reply to the call automatically. This features
allows you to disable the automatic reply. The ability to send your position to another station
is an added feature of DSC radios that have GPS attached. It is handy for rendezvous and
rescue situations.
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I J K L I M L N
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To Set The Individual Reply Auto or Manual:
1. Enter the DSC SETUP MENU menu and scroll to
INDIVID CALL REPLY (Individual Call Reply) with the
Up/Down soft keys or the UP/Down channel buttons.
2. Press the ENTR soft key and observe the current
highlighted setting — AUTO or MANUAL.
3. Use the Up/Down soft keys or the Up/Down channel
buttons to change the setting.
4. Press the ENTR soft key to select the setting and return
to the DSC SETUP MENU.
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The Manual position entry feature allow you to enter the time (UTC time), Latitude and
Longitude.
To Enter the Time, Latitude, and Longitude:
1. Enter the DSC SETUP MENU menu and scroll to MANUAL ENTRY
with the Up/Down soft keys or the UP/Down channel buttons.
2. The cursor will begin to blink at the rst number of the
UTC time entry.
3. Use the Up/Down soft keys or the Up/Down channel buttons to scroll through the
number list.
4.
Press the ENTR soft key to select a number. This will also move the blinking cursor to the
next number under UTC Time.
5. Repeat steps 5 and 6 to enter additional numbers.
6. After entering the UTC time, press the ENTR soft key to move the blinking cursor to the
rst number under LAT (Latitude).
7. Use the Up/Down soft keys or the Up/Down channel buttons to scroll through the
number list.
8. Press the ENTR soft key to select the rst number and move the cursor to the next
number under LAT.
9. Repeat steps 9 and 10 until the seventh (7) digit of the LAT is entered.
10.
After entering the LAT (Latitude), press the ENTR soft key to move the blinking cursor to the
rst number under LON (Longitude).
11. Use the Up/Down soft keys or the Up/Down channel buttons to scroll through the
number list.
12. Press the ENTR soft key to select the rst number and move the cursor to the next
number under LON.
13.
Repeat steps 9 and 10 until the eighth (8) digit of the LON is entered.
14. Press the ENTR button to save the entry and the radio will return to the DSC SETUP MENU.
MENU EXIT: You can exit the menu at any time by pressing the EXIT soft key on any screen. This
method will exit to the next highest menu, repeated presses of the EXIT soft key will return the
radio to the radio standby mode. The menu EXIT selection in the menu screen will return the radio
immediately to the radio standby mode. When in the menu, just scroll down until the EXIT option is
highlighted, then press the ENTR soft key.
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Cobra MRF77 Specifications

General

GPS	Yes
Display	LCD
NOAA Weather Radio	Yes
DSC (Digital Selective Calling)	Yes
Voltage Range	12 VDC
Waterproof Rating	IPX7
Channels	All U.S., Canadian, and International channels
Frequency Range	156.050 MHz to 163.275 MHz
Number of Channels	All U.S., Canadian, and International channels

Summary

Digital Select Calling (DSC) Setup

Position Request Reply Type

Configure automatic or manual response to position requests from other stations.

Auto Channel Switch

Enable or disable automatic channel switching upon receiving an Individual Call.

Individual Call Reply

Set radio to automatically reply to individual DSC calls or prompt for manual reply.

Manual Entry

Manually enter UTC time, latitude, and longitude for DSC operations.

Advanced Operation

Weather Alert Signal

Alerts for NOAA weather broadcasts, switching to Weather Radio mode.

Channel 16+

Quick access to Channel 16 or Channel 9 from any operational mode.

Tri-Watch

Scan three important channels simultaneously, including Channel 16 and 9.

Advanced Operation

Memory Channels

Program or tag channels for scanning in Memory Scan mode.

Memory Scan

Scan only programmed memory channels, stopping on detected activity.

Advanced Operation

Public Address

Use PA mode for voice transmission to nearby vessels or people via an external speaker.

Burp Feature

Expel water from the speaker grill by emitting a tone.

Rewind-Say-Again® Feature

Replay the last 20 seconds of an incoming audio transmission.

Digital Select Calling (DSC) Operation

Sending Distress Calls

Initiate a DSC distress call with or without position and nature of distress.

Abort The Distress Call Process

Cancel a distress call transmission process if initiated by mistake.

Cancelling a Distress Call

Follow-up voice cancellation procedure for an acknowledged DSC distress alert.

Advanced Operation

Receiving Distress Calls

Receive DSC distress calls, alarm, and switch to Channel 16.

Sending An All Ships Calls

Send urgent or safety messages to all stations within range.

Receiving An All Ships Call

Receive All Ships calls, alarm, and switch to Channel 16.

Advanced Operation

Sending A Geographical Call

This radio does not send geographical calls; requires specialized equipment.

Sending An Individual Call

Request communication with one exclusive station using DSC.

Advanced Operation

Receiving An Individual Call

Receive an individual DSC call, alarm, and switch to the caller's channel.

Sending A Group Call

Send a DSC call to a group of stations using a group MMSI.

Receiving A Group Call

Receive a group DSC call, alarm, and switch to the selected channel.

Sending A Position Request

Request the position of another station equipped with GPS.

Advanced Operation

Receiving A Position Request

Respond to or ignore a position request from another station based on settings.

Advanced Operation

Sending A Position Send

Initiate sending your position to another station using GPS.

Receiving A Position Send

Receive position information sent by another station.

Advanced Operation

Call Log and Distress Log

Review and manage received DSC messages and distress logs.

Test Call

Confirm radio operational status and DSC call function.

Alarm In

Connect to chart plotter alarm output for alerts like arrival or off-course.

Maintenance And Troubleshooting

Maintenance

Guidelines for keeping the VHF radio clean and in good operating condition.

Troubleshooting

Solutions for common problems like no display, transmission issues, or no sound.

Specifications

Appendix

VHF Marine Channel Assignments

Details on VHF marine channel usage and assignments in different regions.

Appendix

Weather Channel Assignments

List of weather channels and their frequencies.

World City Time Zones

Warranty

Product Service

Customer Service

Instructions for obtaining customer assistance and factory service for the product.