Lowrance Mark-4 HDI Review in 2024 – Fish Finder

Lowrance Mark 4 HDI Review

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The Lowrance Mark-4 HDI is a revamped version of the well-known Mark-4 and Mark-4 DSI models. The Mark-4 HDI combines both models into one, thus it includes the original SONAR as well as the DSI’s DownScan SONAR. To round things off, it is considerably less expensive than other versions with comparable technology. Of course, the display is tiny and black and white, but don’t be fooled; it still packs a punch and is ideal for tight budgets or small boats.

Larger screen size:

The Mark-4 HDI features a 30 percent larger screen than the original Mark-4 series. At just over 4 inches, this guy is about the size of an iPhone screen, which should be acceptable viewing when mounted on the dash or nearby – it’s not a monster like the HDS, which you can see from across your boat, but it should suffice for weekend fishing trips this summer!

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DownScan overlay:

You may overlay DownScan SONAR and regular SONAR on one big display, as shown in the picture above. This way you can get the most out of both systems since DownScan is better equipped to find structure and regular SONAR is better equipped to find individual fish.

Lowranc Mar 4 HDI

Highly detailed mapping:

The Mark-4 HDI is a small but mean GPS and mapping device, with options to add further chips for expanded maps, such as Lake InsightTM and Nautic InsightTM PRO and HD, Navionics® Gold, HotMaps® Premium. The default map contains data for over 300 US lakes and waterways.


  • Depth Alarm: Yes
  • Shallow Alarm: Yes
  • Temperature Readings: Yes

Max Depth Per Transducer Type

  • DownScan Imaging™: Max 300′ / 91M @ 455/800 KHz
  • Broadband Sounder™: Max 750′ / 229M @ 83/200 kHz, 2000′ / 610M @ 50/200 kHz


  • Display Size: 4.3″/10.92cm
  • Resolution: 480 x 272
  • Backlighting: 11-Level LED
  • Power Output: Max 250W RMS
  • Languages: 30
  • HDI Operating Frequencies: 83/200 kHz or 50/200 kHz + 455/800 kHz
  • Operating Voltage: 12VDC (10-17VDC min-max)
  • Media Port: One (1) high-capacity microSD slot
  • Warranty: One year

Lowrance Mark 4 HDI specs


  • Waterproof Standard/Rating: IPx7
  • Product Width: 3.8″\ 96mm
  • Product Depth: 2.2″ \ 56mm
  • Product Height: 6.6″ \ 168mm (7.5″ \ 189mm w/bracket)


  • Power Supply (Supply Voltage): 12 VDC (10-17 VDC min-max)

GPS Navigation

  • Navigation: Routes: 100
  • Navigation: Waypoint Storage: 3,000
  • GPS Antenna Type: Internal high-sensitivity WAAS + EGNOS + MSAS
  • (optional external antenna)
  • Plot Trails: Up to 100 trails – up to 10,000 points / trail
  • GPS Alarms: Yes
  • Background Mapping: Over 3,000 enhanced lake maps with depth contour and shoreline detail, as well as coastal depth contours/shoreline detail and spot depth soundings to 1,000’/305M
  • Mapping Options: Lake Insight™ and Nautic Insight™ PRO and HD,
  • Navionics® Gold and HotMaps® Premium, Fishing Hotspots®PRO

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Shane Baker

Shane Baker

My name is Shane Baker and when I am not with my family or working here I am out fishing! I caught my first fish when I was 6 – it was a trout at a stocked pond here in TX. Ever since fishing has been a passion of mine!

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