HT644 User Guide:HT700.qxd
Contents
1. 9 79 m The Entel HT644 is a professional marine handheld transceiver that operates on the VHF marine band 644 has 58 marine international channels 10 weather amp 36 dealer programmable private channels The 58 marine channels are switchable to comply with USA International or Canadian regula tions This is done via the radio s keypad It has an emergency channel which can be immediately selected from any channel using the red 16 9 button Weather channels can also be accessed immediately using the WX key The HT644 includes the following features Scan quick access channels battery life indicator VOX voice activated transmit low battery indicator large LCD with back light 644 ransceiver CNB750E Rechargeable 1800mAh Li lon battery Antenna CBH750 Spring loaded belt clip Advice Do not use options or accessories not specified by Entel Ensure that the radio is used within the parameters for which it was designed Please switch the transceiver off before connecting optional accessories Warning Turn the transceiver off in the following locations In explosive atmospheres flammable gas dust including metallic amp grain powders etc Whilst taking on fuel or while parked near a fuel station Near explosives or blasting sites In aircraft medical institutions or near persons known to be wearing a pacemaker Caution Do not disassemble or2. 5 e X GENERAL Frequency Range 156 163 275 Channel Spacing 25 kHz Communication Method Simplex Antenna High Efficiency Helical Antenna Impedance 50 ohm Power Supply Voltage 74V DC Battery Life 8 Hours Standby 40mA 390 mA 1 0 W audio output 2 Current Drain nominal Tx Less than at2W 0 7 A at IW Duty Cycle TX 1076 RX 1076 Standby 8076 Microphone Internal condenser microphone Operating Temperature 20 C to 60 C 19 GENERAL Height 130mm _ 145mm including knobs Width 59 5 62mm including protrusions Diameter 37mm 4lmm including battery protrusions Less than 300g TRANSMITTER Frequency Range 156 025 157 425 Power Output Selectable HIGH 5W LOW IW Modulation 6 Oscillator Method PLL Frequency Stability 2PPM Maximum Deviation 5 kHz Audio Distortion lt 5 1 kHz 60 Spurious Emissiong 55db Hum amp Noise RECEIVER Frequency Range 40 dB 156 163 275MHz Receiver Type Double Super Heterodyne type Sensitivity lt 0 25uV I2dB SINAD Frequency Stability 2PPM Spurious Rejection 60 dB Adjacent Channel Selectivity 70 dB Distortion lt 3 Typical Hum amp Noise 40 dB Audio Output IW Speaker Size 38 mm 20 suone jy
3. c 9 A UJ oon 0 POWER SWITCH 5 WX 6 SCAN 4 16 9 UP DOWN amp 7 MICROPHONE SPEAKER Power amp Volume Control Powers the radio on and off and controls the volume The Microphone Internal condenser microphone Up Down Buttons Press up down buttons to change channel 16 9 Button A momentary press of the button selects channel 16 and a longer pressselect channel 9 WX Button Immediately recalls the weather channels Scan Button Starts Stops scanning the programmed channels The MEM Button Memorises a desired channel for scanning The Button Provides Instant access to preassigned channels if programmed Speaker The Radio s Speaker LAME d LAM Pi KEY LOCK 22 c 83 HIL 9 o ji S PTT PUSH TO TALK if ACCESSORY CONNECTOR Eu E ANTENNA CONNECTOR dt BATTERY PACK 10 Lamp Key lock Button Momentarily pressing this button illuminates the LCD display 12 13 14 15 16 17 Holding this button for over second activates the key lock To deactivate the key lock press amp hold the button again until the lock removes The Radio s Battery Pack Rechargable lithium ion battey pack PTT Push To Talk Switch Hold down to transmit release to receive H L Button Press and hold this button f
4. 156 025 160 625 Pubic Comespondence Marine Operator 60A X 160 075 U S Govemment only Canadian Coast Guard Pacific Coast Commercial Fishing East Coast 61 X 156 075 160 675 Public Correspondence Marine Operator Port operation ship movement 62 X 68 156 125 Pacific coast Coast Guard East Coast Commercial fishing only 62 X 156 125 160 725 Public Correspondence Marine Operator Port operation E 9 eres 1007 x S 166 175 and ConmercalviSinseededareas __ 63 X 156 175 160 775 Public Correspondence Marine Operator Port operation ship movement XIX 156 225 U S Govemment only Canadian Commercial Fishing X 156 225 160 825 Public Correspondence Marine Operator Port operation ship movement 156 275 5 Public ence Marine rator Port jon 156 275 150 875 t Correspondence Marine Operator Port operation 156 325 x 156 325 160 925 Public Correspondence Marine Operator Port operation ship movement T X 5 US Commercial Used for Bridge to bridge communications in lower eee Mississippi River Inter ship only Canada Commercial fishing S amp R 68 X X X S 156 425 Non commercial Recreational 156 475 US Non commercial Recreational Canada Commercial fishing only International Port operations and Ship movement X X X S 156 525 Digital selective calling v
5. button to store the channel in the transceiver memory MEM is displayed the LCD This channel is now memorised to be scanned 3 To add further channels repeat steps amp 2 4 To delete a channel from the transceiver s scan list press the MEM button a channel that displays the MEM icon until the icon disappears 5 All channels programmed remain in the transceiver s scan memory even if the power is switched off 6 Adjust the squelch control until the white noise is eliminated 7 To start scanning press the SCAN key The scan proceeds from the lowest to the highest programmed channel number amp stops on channels when a transmission is received 8 To stop the scan at any time press the SCAN key again VOX Voice Operated Transmit Press the MEM button amp switch the transceiver The VOX symbol amp a 0 will flash 0 indicates VOX is switched off is for low sensitivity 5 is for normal sensitivity 9 is for high sensitivity Use the UP DOWN button to select the desired level press MEM to confirm the transceiver is now set to VOX To switch VOX off go back into VOX programming mode by holding the MEM key whilst switching on Press the UP DOWN button until the vox level is off and press MEM to confirm In VOX mode the transceiver will react to your voice and transmit automatically without you having to press the PTT button There is always a slight delay for the electronic
6. down the 16 9 key for second to select channel 9 To recall the previous channel used press the 16 9 button twice Monitor Channels Press the blue monitor button on the top of the radio to defeat the squelch mute and release button to mute radio A long press radio will beep will hold the squelch mute open until pressed again to cancel again to return to squelch mute Adjusting Squelch Threshold Press the blue monitor button on the top of the radio and switch radio on Use gt amp cs buttons to adjust threshold between 01 16 Press MEM to store the setting SIMPLEX DUPLEX CHANNEL USE Your transceiver has been factory programmed in accordance with FCC USA Industry Canada and International regulations The mode of operation cannot be altered from simplex to duplex or vice versa Simplex or duplex mode is automatically activated depending on the channel and the channel set and whether USA Canadian or International mode is selected Refer to the channel charts listed on pages 22 24 of this user manual If you have a licence to use a specific simplex or semi duplex channel contact your dealer who may be able to programme your channel using the transceiver s private channel memory CHANNEL A B INSTANT ACCESS For your convenience two user assigned channels can be programmed for instant access If the A B key is pressed and no channel A or B has been assigned a short beep will be heard PRO
7. Ensure you re fit the accessory cover so as to protect the socket On Battery amp Charger Options 750 Spare 1800mAh Lithium lon battery pack with rear clip CLB750G Spare 2000mAh Lithium Manganese non rechargeable battery with rear clip CSAHT way intelligent rapid charger 10 230v CSBHT 6 way intelligent rapid charger 10 230v CCAHT 230 way trickle charger with 230V mains adapter 110 trickle charger with 1 10 mains adapter 12 l way trickle charger with cigar lighter lead 12V DC operation Carry Options CFC750 HT64X soft leatherette case finished in black with carry strap SEC 752 HT642 HT648 heavy duty black leather case with strap amp belt loop CLC753 HT644 amp HT649 heavy duty black leather case with strap amp belt loop CBH750 Spare spring loaded belt clip Audio Accessory Options CMPI 750 Compact medium duty speaker microphone with earpiece jack CMP750 Heavy duty submersible speaker microphone EHP9 D shaped earpiece plugs into CMP1 750 CMP750 above EA 12 750 D shaped earpiece with in line PTT microphone amp VOX EA 15 750 Earpiece microphone with transparent acoustic tube amp VOX EA 19 750 D shaped earpiece with boom microphone and in line PTT amp VOX EHP750 D Shaped earpiece connects directly to radio EPT40 750 conductive earpiece microphone with PTT CXR5 750 conductive skull microphone with in line PTT CXRI6 7
8. switching amp consideration will need to be given To get optimum performance from the VOX feature you should use a noise cancelling headset or earpiece microphone see accessory options Indicator Description mm High power selected 5 Watts Low power 1 Watt The Radio is Transmitting The Radio is Recieving Indicated channel is memorised for scanning Scrambler mode enabled version A amp B only Voice operated transmit mode enabled Indicates the channel set for USA Indicates the channel set for Canadian Indicates the channel set for International NOAA weather channels selected USA amp Canadian waters only A ship to ship channel in USA or Canadian mode Battery life indicator Indicates keypad is locked excluding the PTT H L amp LAMP buttons Private channel number selected Duplex channel selected not simplex vo gt U Jg 4 Attaching amp Removing Accessories To attach an accessory Remove the accessory cover by unscrewing the locking screw anti clockwise leave cover attached or store in a safe place Attach accessory plug to the socket Carefully tighten the locking screw clockwise until finger tight do not tighten with a screwdriver etc To remove an accessory Unscrew the locking screw of the accessory by hand in an anti clockwise direction carefully use a coin or screwdriver if too tight
9. the LED indicator will pulse amber every 3 seconds to further verify its circuitry is functioning correctly Select the desired audio level by further rotating the control clockwise After power on the transceiver will always default to the last channel selected 2 Turn the squelch control fully counter clockwise then rotate clockwise until the white noise stops This condition is known as the squelch threshold If the control is turned clockwise past this point weak signals may not be received No noise or signal is heard until a signal is received that exceeds the squelch threshold 3 Select the desired channel using the UP DOWN buttons A full listing of channels can be found on page 22 24 Sometimes a slight adjustment of the squelch threshold is needed as some chan nels have a higher noise level than others 4 When receiving a signal the LED indicator illuminates green An RX is also displayed on the LCD o Perform steps through 3 of RECEPTION 2 Before transmitting monitor the channel and make sure it is clear 3 For communications over short distances press the H L key and select low power 1 watt Transmitting on watt prolongs battery life should be selected whenever possible 4 When receiving a signal wait until the signal stops before transmitting The transceiver cannot transmit and receive simultaneously 5 Press the PTT Push To Talk switch to begin your transmission confirm
10. water unless attached securely to the radio or get it wet by other means e Use only the specified charger and observe charging requirements e Do Not pierce the battery with any object or strike it with an instrument Do Not use the battery pack if it is damaged in any way Do Not reverse charge or reverse connect the battery e Do Not touch a ruptured or leaking battery If liquids from the battery get into your eyes immediately Wash your eyes out with fresh water amp avoiding rubbing them Seek medical treatment Warranty The warranty on all batteries is 12 months from new Battery Pack e battery is not to be used for an extended period of time e g several months remove the battery pack from the equipment and store in a cool and dry location around 0 C part charged Do not fully discharge the battery before storage e Each charge cycle reduces battery s life Minimise the number of times you charge your battery especially in hotter environments which further shortens a battery s life Battery Charging Connect the AC adapter to the charger pod LED status light will illuminate green indicating ready for charge 2 Turn the transceiver off 3 Insert the battery pack into the charger pod either with or without the transceiver attached The LED status light changes from green to RED amp trickle charge begins 4 A fully discharged battery pack will take approximately 6 hours
11. 50 D shaped earpiece and throat microphone with in line PTT 1 750 Light weight single earpiece headset with in line PTT amp VOX 750 5 Single earpiece ear defender headset with boom mic and in line PTT for hard hat amp VOX CHP750HD Double earpiece defender headset with boom mic and in line PTT for hard hat amp VOX CHP750D Double earpiece headband defender headset with boom mic and in line PTT amp VOX CHP750BT Bluetooth double earpiece headband defender headset with boom mic and ear cup PTT CBH750 Spare spring loaded belt clip VOX Voice Operated Transmit hands free operation gt A V 7 ES 7 For complete to date list of optional accessories visit www entel co uk Standard Features Environmentally protected to IP68 i e submersible to 5 metres for up to 60 minutes Robust design exceeds MIL STD 810C D E F LCD screen to display channel number amp current settings status 800mAH Lithium lon battery for superior operational time INT USA CAN channels Full transmit power output 5 Watts Exceptionally loud amp clear audio Ch 1619 shortcut button WX shortcut button Scan button Monitor button MEM button Automatic power save to further increase operational time Low battery alert indicates when the battery needs charging or replacing Dealer Programmable Features Key lock button Prefixed minimum volume level and fixed bleep level
12. GRAMMING INSTANT ACCESS BUTTONS Hold down the key and turn on the transceiver 2 The letter A will appear on the display and dashes _ designated channel 3 Press the UP DOWN button until the desired channel number is displayed 4 With the desired channel number displayed press the MEM key once The A will stop flashing indicating that the displayed channel is now designated channel A 5 Press the A B button again The letter b will appear on the display Repeat steps 2 through to 4 6 Switch transceiver off and on to exit this mode and save changes If you wish to clear instant access channels follow step then press the MEM key The will flash Now switch the transceiver off and on again indicate that no channel has been Note Should you later wish to delete any stored channels simply press MEM key whilst in programming mode OPERATION OF A B INSTANT ACCESS BUTTONS Pressing the A B button will toggle between A B and the previous selected working channel Channel A is represented by the A to the left of the channel number on the LCD amp channel B is represented by B Note Do not confuse this A with the one that is sometimes displayed to the right hand side of the channel number in USA and Canadian modes 2 U c 5 Scan Function Select the desired channel to be scanned using the gt amp w buttons 2 Press the MEM
13. HT644 User Guide v03 10 Professional submersible marine handheld transceivers Certification Introduction Packing List Radio Care Preparing Your Radio For Use Battery Care Information Using Your HT644 Reception Transmitting Channels Functions The Scan Function VOX Voice Operate Transmit LCD Indicators Optional Accessories Standard Features Controls Glossary of Terms Troubleshooting Channel Chart Technical Specifications Notes Page RO 0000 KRW WW 9 amp 12 12 13 amp 14 15 l6 17 amp 18 19 amp 20 21 amp 22 CE Compliance Statement The 644 transceiver displays on the serial number label indicating its compliance with the essential requirements of the EEC directive for Electromagnetic Compatibility Declaration of Conformity Entel UK Limited 320 Centennial Avenue Centennial Park Elstree Borehamwood Hertfordshire United Kingdom WD6 3TJ Declare under our sole responsibility that the product HT644 series VHF handheld transceiver Serial Number To which this declaration relates is in accordance with directive 99 5 EC and conforms to the following standard or other nominative documents EN 301 178 2 1 2 2 2000 08 EN60950 August 1992 A11 1997 EN 60945 2002 amp ETS 300 698 Annex B December 1996 Following provisions of the R amp TTE directive M Austin P QM Eb Wi ISO 9001 REGISTERED FIRM
14. d noise TX Transmit Transceiver A device that can transmit and receive USA Channels Channel designations as defined by the Federal Communications Commission FCCVOX VOX Voice Operated Transmit VHF Very High Frequency 30MHz to 300 MHz SYMPTOM PROBABLE CAUSE REMEDY Battery needs charging or Charge the battery pack battery is exhausted replace the battery pack Use the MEM key to enter desired channels into scan The scan key does not start No channels memorised memory Adjust the squelch to the scan MEM Squelch is not adjusted threshold or to the point where the white noise just disappears Transceiver not switching on T a Cannot change any function Key lock is switched on Turn key lock off Defective battery or charger Dirty terminal contact on battery or charger No transmit or cannot select Some channels are low power Change to high power channel high power only Battery pack exhausted Charge replace the battery Hold MEM button for 2 secs use UP or DOWN button amp select off to turn VOX off Contact your dealer Clean contacts with dry clean cloth The LED on the charger does not illuminate when charging Transceiver transmits without pressing PTT button Buttons VOX has been enabled seem to work intermittently Channel Chart VHF MARINE CHANNEL CHART CH U C s TX CHANNELUSE 2 2 X X D
15. i edg Use this page record important information such as the serial number of your radio and private channels programmed by your dealer 21 22 lt Intended Country Of LIBE OCZ 1 E LI EL LIES LIFR OIT Brey LILV LILT 08910 Jistered Community Design _ CIMT 4 or 8 Design Patent Pending No 2 yright and Unregistered Desig rights reserved Headquarters United Kingdc al s 1O O O O N A D D c LLI Xem gt Q O O
16. mespondence Marine Operator 157 350 161 950 Public Correspondence Marine Operator 157 400 162 000 Public Correspondence Marine Operator ule xp Lx IE x Lx T x pe m LIE ne a a e 18 Specifcations CH U C SD TX CHANNELUSE 0 2 Fe 15725 Punc corespondence Mame Operon Fes 157 275 161 875 Pubic corespondence opea rasa S 157325 Pubic coresoondence Mame Operon X X X b 157325 161 925 Pubie conespandence Marne Opersio 187375 191575 157 25 982550 Weather eceveon SS 162 400 wearten 162 475 Wemmermeweon 962 425 x o i2450 16250 Wesmermekeony x o 12525 Wesrmeeony 169 650 x o 6 775 Weaher eceveon x x x p 163275 weere cifications E 50450455551 X x qm x gt 5 X e gt lt e ao x X x gt e x x X e gt
17. modify the transceiver for any reason Do not transmit while touching the antenna terminal or any exposed metallic parts of the aerial as this may result in a burn Please check and observe regulations in your country with regard to use whilst driving CBH750 Spring loaded belt clip e CCA trickle charger included with certain models Cleaning your Radio After exposure to any potentially corrosive substance including salt water it is recommended to thoroughly wash the transceiver in fresh water If washing with the battery removed from the radio ensure that the battery is not immersed in water amp clean only with a damp cloth Note Do not wash the transceiver if you suspect the waterproofing seal may be damaged Please return to your supplier for inspection repair End of Life Disposal When your Entel transceiver reaches the end of its useful life please ensure that the unit is disposed of in an environmentally friendly way For country specific information please see www entel co uk recycling Attaching Removing the Battery Pack 1 1 To attach locate the pegs the bottom of the battery into the slots on the radio and press the top of the battery against the radio Secure battery by tightening the screw clockwise by hand Do not over tighten 2 To remove unscrew the locking screw anticlockwise amp pull the battery away from the top of the radio Attaching Removi
18. ng the Aerial 3 To attach carefully align the aerial with the socket Screw in the aerial clockwise taking care not to cross the thread until it is seated firmly against the top of the radio 4 To remove unscrew the aerial anti clockwise Attaching Removing the Belt Clip 5 To attach slot the clip onto the slot on the back of the battery and slide up until you hear a click 6 To remove pull the tab towards the belt t clip EM Then slide the belt clip downwards Introduction Your Entel radio is supplied with a high performance Lithium lon Li lon battery These batteries e Extend talk time e Reduce the battery s size and weight Do not suffer from memory effect that reduces the life of Ni Cad and NiMH batteries e Have a low toxicity therefore reducing the impact on the environment Battery Pack Precautions e Switch the transceiver OFF before charging e Charge the battery pack before use Do not recharge the battery pack if it is already fully charged e Charge the battery in accordance with the instructions enclosed with your charger e Do not charge the transceiver and or battery pack if they are wet The battery pack includes potentially hazardous components Please e Do Not disassemble or reconstruct battery Do Not short circuit the battery Do Not incinerate or apply heat to the battery Do Not immerse the battery in
19. oice communications not allowed 156 575 US Canada Non commercial Recreational 18578 Atop a 7 156 625 Non commercial Inter ship only 67 x px ajal a aj oN SEE 156 875 156 925 156 925 161 525 Correspondence Marine Operator Port operation s 1570 X 5187125 161 625 somem sa S 157075 US Goverment only Envronmenial protecion mmm 8 157 175 US Govemment oni Canadian CoasiGuadOny x 56 725 US Port Operations Commercial fishi 1672 fishing Ed ck le erc F 156 975 X 156 975 Port operation and Ship movement Pat 167 075 161 675 Fotoemmn sipmoemet 0 7 s 157 125 US Govemmentonly Canadian CoastGuardOny S 157225 PubleComespondence Operatoy 84 X X X D 157 225 17 VHF MARINE CHANNEL CHART RX CHANNEL USE Eg 156 050 Part Operation and Commercial VTS in selected areas 156 050 160 650 Public Correspondence Marine Operator eo I e gt 156450 D 156 150 160 750 Public Correspondence Marine Operator 1s 156200 Pacific coast Coast Guard East Coast Commercial fishing 156 200 160 800 Public Correspondence Marine Operator Por
20. or second to toggle between high and low power 1 amp 5 Watts The Accessory Connector Used to attach any 644 approved accessory LED Indicator Indicates the status of the radio e RED Steady Transmitting e RED Flashing slowly Battery needs re charging GREEN Steady Receiving Monitor Button Press to monitor the channel without the squelch mute Antenna Connector Use to attach the antenna of the radio 14 Glossary Canadian Channels Description Channels designated as defined and regulated by Industry Canada RIC Marine Communications amp Traffic Services Duplex Transmit and receive on different frequencies Encryption Scrambled audio for extra privacy FM Frequency Modulation International Channels Channel designations as defined for use in international waters by the International Telecommunications Union ITU Marina Channels Special channels reserved for marinas located in selected European countries These channels are pre programmed in the transceiver as amp P2 Private Channels Channels which are assigned by regulatory agencies governing VHF radio use for a specific region or country These channels are prefixed with a P and can only be programmed into the transceiver by authorised dealers PTT Press To Talk Transmit RX Receive Simplex Transmit and receive on the same frequency Squelch To suppress backgroun
21. t operation ship movement E3 156 250 Port operation VTS in Seattie 156 250 160 850 Public Correspondence Marine Operator Port operation ship movement 156 300 Inter ship Safety X 156 350 160 950 Public Correspondence Marine Operator Port operation ship movement 156 400 Commercial Inter ship only 156 450 Boater Calli channel Commercial amp Non commercial d Recrea X 156 550 5 ES ES m gt 5 5 c ce c k ok ok ca co x s 166566 a Loc zx S gt gt s 55950 s 155950 a h 156 950 161 550 Port operation ship movement 157 000 Port Operation xs peras eren Canadian Coast Guard Only Interational Port operation and 5 187 050 0 Goverment ont Canadian Coast __ x o 787 050 161 650 Poroneraton shipmavement 00 7 157 100 US and Canadian Coast Guard Liaison and Maritime Safety 5 1507799 imanen an daneo ___ X D 157 100 161 700 Port operation ship movement 000000 s 157150 X jUS amp Gowmmetony D 157150 161 760 Pubic Correspondence Warne Ope D 157 200 161 800 Pubic Corespondence Manne Opeon D 157 250 161 850 Correspondence Operon LU D 15 E E gt e x gt x 157 300 161 800 Public Co
22. to charge depending on the remaining power condition VVhen charge is complete the LED status light turns green Battery Indicator For your safety and convenience your transceiver continually monitors the battery pack and gives an indication on the LCD 3 Segments 12 2 Segments lhour FX e Segment 20mins Note Only genuine Entel batteries should be used Customer satisfaction is assured as you can not be supplied with sub standard potentially dangerous battery packs from 3rd party manufacturers ensuring it delivers the expected capacity and endurance On HT series batteries a breathable membrane is used This is clearly marked on the battery label Piercing the membrane will allow water ingress to the battery amp will invalidate the warranty Turning The Radio amp Off Turn the ON OFF control on the top of the radio clockwise until the LCD iluminates amp a short beep is emitted To turn the radio off turn the ON OFF control anti clock wise until the LCD deluminates Using Your radio Before using your radio you may need to adjust the volume on the radio to take in to account background noise Adjust the volume using the rotary control on the top of the radio EB Turn the transceiver rotating the volume control a clockwise direction A power tone is generated after second to indicate the transceiver has passed its self diagnostic test During standby
23. transmission in progress the LCD indicator illuminates TX and the LED illuminates RED 6 Hold the transceiver inch from your mouth and speak slowly and clearly into the microphone 7 When the transmission is finished release the PTT switch C a 53 mj A a INT USA amp Canadian Modes In compliance with worldwide license regulations the following version of HT640 are available Version A INT USA amp Canadian modes Version B C amp D INT mode only In the case of version A only to change the channel set of the transceiver hold down the WX key The mode changes from USA to Canadian to International 2 Refer to the marine channel charts in this booklet for allocated channels in each mode NOAA Weather Channels Applicable to version A model only To receive a weather channel press the WX key The transceiver enters into weather channel mode 2 There are 10 weather channels Use the gt amp C buttons to select the desired channel 3 To exit from the weather channels press the WX key The transceiver recalls the previous working channel Emergency Channels To select the emergency channel press the 16 9 button from any channel Channel 16 appears on the display To recall the previous channel used press the 16 9 button once again Channel 9 Channel 9 is used as a hailing channel for initial non emergency contact with other vessels Hold
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