HALO™-4 Pulse Compression Radar

Part # 000-11470-001

* For current Halo Radar owners, please click here to see our product notice *

Combining the best characteristics of traditional pulse and FMCW broadband radar systems, our Halo™ Radar uses Pulse Compression technology to provide an unprecedented mix of long and short detection range, high target definition, and minimal clutter. Solid State technology means minimal warm-up time and maximum ocean-going reliability, while low-power pulsed transmissions make Halo Radar safe to run in anchorages and marinas.

Key Features

  • True 64nm range with 4-foot open array antenna
  • Beam Sharpening with Target Separation Control
  • Dual Range operation
  • Advanced signal processing with Custom, Harbour, Offshore, Weather, and BIRD modes
  • High-speed 48RPM operation
  • InstantOn™, ready in 16-25 seconds from power-on, instant from standby
  • MARPA target tracking, up to 10 targets (20 with dual range)
  • Low electromagnetic emissions and radiation
  • Low power consumption with 12/24V operation
  • Ethernet connectivity
  • Unique blue LED accent lighting with brightness control

New Feature: Velocity Track
VelocityTrack™ technology provides instant visual feedback on the motion of radar targets in relation to your boat. This powerful add-on offers yet another way for Halo™ radar to improve your situational awareness and reduce your risk of collision.

Download the information sheet
Purchase an unlock code 

Where To Buy

    Solid-State with Pulse Compression Technology
    Simrad Halo Radar is the world's first high performance, solid-state radar with pulse compression technology designed specifically for recreational mariners. Unlike traditional pulse radar, Halo Radar isn't reliant on a high-powered magnetron (vacuum tube) to transmit. Instead, Halo Radar uses solid-state electronics and low-power 25W pulsed, frequency-swept transmission bursts to deliver pulse radar-like range and resolution, without the associated warm-up time, power consumption, or electromagnetic emissions.

    64nm Range
    Halo Radar delivers a maximum range comparable to traditional 6kW pulse radar, at up to 64nm with the HALO-4 Radar’s 4-foot open array antenna. It offers unprecedented 6m (20ft) minimum range, peering into that pulse-radar blind spot where once only FMCW (3G/4G) Broadband Radar could operate.

    Halo™ sees all the way across the bay
    From Pax River, Halo™ sees all the way across the Cheasapeake Bay(1) and detects storms over Cambridge, Maryland(2)

    Beam Sharpening
    Whether you're looking at a flock of birds or a string of channel markers, separating one radar target from another is key. Beam Sharpening with Target Separation Control provides unmatched target resolution, granting the Halo Pulse Compression Radar's 4-foot open array antenna the same effective target resolution as a 6-foot array without beam sharpening.

    Superior target separation
    Halo™ shows clear separation of even the smallest targets, as seen in this sailing dingy race.

    Dual Range Operation
    With Dual Range, Halo Radar functions like two arrays in one – monitor two distance ranges simultaneously with independent displays, controls, and totally independent MARPA target tracking. Take full advantage of Halo Radar's combination of short-, mid-, and long-range performance to keep an eye on faraway weather cells, while monitoring channel markers and high speed watercraft up close.

    300ft and up to 64nm - same time & screen
    Halo™ lets you see near and far in Dual Range mode, with competely independent split-screen displays. Note a remarkably small 20ft main bang area(1)

    Target Detection
    Installed 15m high, the HALO-4 Radar meets tough IEC 62388 Annex D target detection specifications (excluding beacon and RACON triggering). Installed 3m high, the HALO-4 Radar offers similar target detection performance to our proven Simrad TX06S-1 6kW/4-foot open array pulse radar.

    View comparison table

    MARPA Target Tracking
    Track up to 10 user-selected radar targets, displaying CPA (closest point of approach) and TCPA (time to closest point of approach). Up to 20 different targets can be tracked in Dual Range mode, with 10 targets per screen. MARPA functionality requires a heading sensor and GPS.

    Advanced Signal Processing
    Halo Radar employs advanced signal processing for digital azimuth and range sidelobe reduction, enhancing discrimination of small targets such as channel markers from larger adjacent targets such as ships and bridges. In addition, Directional Sea Clutter Rejection dynamically changes gain in the sweep to allow smaller targets to be seen in the leeward. Coming soon via free NSS/NSO evo2 software update, Sector Blanking reduces on-screen clutter by eliminating unwanted reflections in up to four user-defined zones.

    5 Usage Modes with Automatic Harbour/Offshore Selection
    Custom, Harbour, Offshore, Weather, and BIRD modes tune Halo Radar's advanced signal processing to help ensure the targets you're interested in can be seen vividly – even in the toughest environmental conditions. Automatic selection of Harbour and Offshore modes configures your Halo Radar to suit your surroundings, while a 'Custom' mode enables easy manual tuning to suit any purpose or condition.

    Birdfinder radar
    Birds mean fish, and Halo's dedicated birdfinder mode means it's easy to find flocks of birds from a distance.

    High Speed Mode
    Halo Pulse Compression Radar provides rapid position updates, with high speed operation up to 48RPM (mode and range dependent). Simrad quality construction and Halo Radar's brushless motor with advanced helical geartrain design ensure exceptionally quiet operation, especially at 48RPM.

    Track multiple high-speed targets
    With high-speed operation, Halo shows target trails of four fast-moving jet skis in Clearwater, Florida harbour.

    Collision hazards won’t wait for your radar to start up – why should you? Halo Radar’s solid-state technology is ready instantly from standby, and in just 16-25 seconds from power-on to fully-operational. Avoid the 2-3 minute warm-up time associated with traditional pulse radar, and trust Halo Radar to produce an immediate, accurate radar image when you need it.

    High Reliability
    Halo Radar is built to last, with its solid-state transceiver meaning no magnetron to replace, and no manual tuning required as the magnetron heats up or ages. Similarly, a solid-state brushless motor driver means no motor brushes to wear out and replace. Be confident that Halo Radar will operate at high speed in winds up to 70 knots, year after year.

    Low Electromagnetic Emissions
    Unlike traditional pulse radar, Halo Radar transmits low-power pulses. This makes Halo Radar safe to run in anchorages and marinas, providing enhanced radar coverage at the very start and end of each journey. In fact, Halo Radar's minimum safe distance in any transmission mode is within the swing circle of its open array antenna.

    Low Power Consumption
    Halo Radar uses 40W average with no wind, and no more than 150W at maximum wind velocity. Experience even greater power savings in standby with just 6.5W power usage, versus 10-15W for pulse radar. With its low power consumption and support for 12/24 volt DC systems, Halo Radar is ideal for small to mid-sized powerboats.

    Ethernet Connectivity
    Simrad Halo Pulse Compression Radar connects to any Simrad NSS evo2 or NSO evo2 multifunction display system via Ethernet, with a bulkhead-mounted interface box below deck. Antenna installation is simple and elegant, with the same thin cable and small-diameter connectors as our 3G/4G Broadband radars.

    Uncompromising Aesthetics

    Bringing the range and reliability of Halo Pulse Compression Radar to your boat doesn’t mean compromising on aesthetics. Halo Radar’s sleek open-array antenna sits atop a uniquely curved pedestal, a departure from traditional boxy and utilitarian radar designs. Display your Halo Radar on the water with soft-glow, dual-beam Blue LED accent lighting, integrated into the pedestal and customizable with 4-level brightness control.

    * Halo™ Pulse Compression Radar’s blue 4 level static accent pedestal lighting may not be approved for use in your boating location. Please check your local boating regulations before turning the blue accent lights ON.


    Product Height 448mm
    Product Weight Unpacked System: 27.6kg/60.8lb±10%
    Antenna 4’: 4.9kg/10.8lb±10%
    RI-12: 1.6kg/3.5lb±10%
    20m (33ft) Cable: 2.3kg/5.0lb±10%
    Operating Temperature -25° to +55°C
    Water Resistance IPX6
    Humidity +40°C, 93% RH
    Specified Standards FCC ID: RAYHALO
    IC: 4697A-HALO
    Emissions compliant to SM1541-4 (including -40dB/dec future design objectives)
    Waterproof Standard/rating IEC60945-4


    Cable Length 20m (65ft). Optional 10m (33ft) cable
    Radar Technology

    Solid-state X-Band transceiver with Pulse Compression technology

    Radar Max Range

    100m / 300ft to 64nm

    Radar Features

    Peak Power Output: 25W ±10% under any transmit condition (up to 10% duty cycle max)

    Radiation Safe Distance: 100W/m2 (Occupational) at 0m - touch anywhere; 10W m2 (Public) measured at .28m/.92ft. FCC CFR47 Part 2.1091 calculated public safe distance is 0.80m/2.6ft. (less than the swing circle of the antenna with either method).


    Power Consumption 150W (peak in 70kt winds), 40W (average with zero wind velocity), 6.5W (standby)
    Power Supply (Supply Voltage) 10.8V – 31.2V DC (12/24 Volt DC systems)


    Pulse Length / PRF Pulse length: 0.04µsec; Chirp length: 2-96µsec; Chirp Bandwidth: 2-32MHz; Up to 1 pulse and 5 chirps in a burst with burst repetition rate of 500-2000Hz. Range and mode dependent. Effective Pulse Compression Ratio less than 150 in all modes.
    Other Features Automatic Harbour, Offshore, Weather and BIRD modes, Custom manual mode, MARPA, Dual Range, InstantON, Low power draw, Low electromagnetic emission


    Antenna Horizontal Beam Width [deg] 1.8° ±10% (-3dB width), 1.6/1.4/1.2° with Beam Sharpening mode enabled (Low/Med/High)
    1.2° ±10% (-3dB width), 1.1/0.9/0.8° with Beam Sharpening mode enabled (Low/Med/High)
    Antenna Receiver Noise Figure [dB] 5
    Antenna Rotation Speed Approx. 24-48RPM (min 20RPM at 70 knots)
    Antenna Type Circulator and Isolator; Radar Mixer: MIC front-end
    Antenna Vertical Beam Width 25° +20% (-3dB width)
    RadarVibration 2-100Hz and 20G, 100,000 cycles
    Synthesized - X-Band 9.410–9.495GHz


    Ethernet 10/100 BaseT, NMEA2000/NMEA0183

    Like this? You may also be interested in...