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The HT649 GMDSS is a MED-certified survival craft radio that carries the essential Wheel Mark logo for EU-registered vessels and the Merchant Shipping (Marine Equipment) Regulations 2016 for UK-registered vessels. It’s designed to function in the most extreme and harshest environments and meets the strict environmental requirements for GMDSS radios.

When you handle Entel’s HT649 GMDSS, you will be impressed by its superior build quality; from the rugged, ergonomic design that fits comfortably in your hand to the exceptionally loud audio. The HT649 is also submersible to a market-leading IP68 rating of 2 meters depth for 4 hours.

HT649 GMDSS is available in two packages:

HT649 P1 – package of radio and primary one-shot emergency battery

HT649 P2 – package of radio with primary one-shot emergency battery, rechargeable Li-ion battery and drop-in charger.


Environmental protection to IP68 (2 Meters for 4 hours)
The practical HT649 Series 2.0 GMDSS portable enjoys an IP68 (2 Meters for 4 hours) rated construction, which means that it is dust protected and fully Submersible.

Meeting MIL-STD 810C/D/E/F/G and providing commercial grade construction for tough, enduring performance. Entel's HT649 Series 2.0 GMDSS portable conforms to stringent standards, enabling it to withstand the everyday rigours of shock, vibration and the corrosive effects of dust and moisture, ensuring many years of trouble free use.

Primary Lithium one-shot Emergency battery
The HT649 Series 2.0 GMDSS portable is supplied with a Lithium battery as standard. With a 4-year shelf life you are assured of a full charge as and when you need to use Entel’s Primary Emergency battery.

2200mAh Secondary Li-ion re-chargeable battery
Optionally the HT649 Series 2.0 GMDSS portable can also be supplied with the latest intelligent Lithium-ion Secondary battery. One key advantage of Lithium-ion battery technology is the way it eliminates ‘memory effect’ meaning there is no need to fully discharge your battery before recharging. Therefore you are assured a full charge each and every time you take your Entel battery from its charger.

Robust accessory socket
The socket has been specifically designed so that when an accessory is secured to the portable, the connection can withstand any amount of punishment; from dropping to careless misuse. Furthermore, the securing bolt incorporates a shearing point to protect the connector.

The HT649 portable provides all INT, USA & CAN Marine channels.


To avoid accidental operation your radios keys & controls can be locked by the user or, if set, automatically by the radio.

VOX hands free (with audio accessory)
When using an Entel VOX enabled audio accessory, your HT649 portable can operate totally hands free. All you need to do is talk and the HT649 portable will automatically transmit for you.

The HT649 Series portable has the facility to scan for an active channel. When the channel is found, the radio will automatically select the channel for you.


Frequency Range 156 - 163.275MHz
Channels 19 INT, USA & CAN Marine Channels
Channel Spacing 25 kHz
Communication Method Simplex / semi duplex
Antenna Impedance 50 ohm
Antenna Whip / stubby
Battery Type Primary – Lithium metal
Secondary - 2200 mAh Lithium-ion
Operating Voltage 7.6V
Current Drain (nominal) 40mA
Secondary Duty Cycle (5/5/90) 17.5 hours
Microphone Internal condenser microphone
Operating Temperature -20° to +55°C
Construction Compliant MIL-STD 810C/D/E/F/G
IP Rating IP68 (2 meters depth for 4 hours)
Size (mm) 59.5(W) x 130(H) x 37(D)
Weight 277g with battery and aerial


Power Output 1.3W
Frequency Stability ± 1.5ppm
Modulation Limiting ± 5.0KHz
FM Hum & Noise >-40dB
Unwanted Emissions <0.25µW up to 1GHz, <1µW from 1GHz to 2GHz
Adjacent Channel Power 70dBc
Audio Response (FM) 300Hz to 3KHz -6dB/Octave
Audio Distortion < 5%
FM Modulation 16K0F3E


Frequency Stability ± 0.5ppm
Analogue Sensitivity >6dBµ for 20dB Sinad
Intermodulation Response >68dB
Adjacent Channel Selectivity >70dB
Spurious Rejection >70dB
Rated Audio Power 0.5W
Audio Distortion < 5%
Hum & Noise >-40dB
Audio Response 300Hz to 3KHz -6dB/Octave
Conducted Spurious Emissions <2nW up to 1GHz, <20nW from 1GHz to 2GHz

As standard each package is supplied with:

P1 Package:

  • Primary battery pack
  • High efficiency antenna
  • Spring loaded belt clip
  • Quick start user guide

P2 Package:

  • Primary battery pack
  • Secondary Li-ion rechargeable battery pack
  • Drop in charger
  • Spring loaded belt clip
  • High efficiency antenna
  • Quick start user guide

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