Humminbird HELIX 5 against HELIX 5 DI: one transducer apart

What is genuinely identical

It is worth laying this out plainly, because the model names make the pair sound further apart than the published figures do. Every one of these is the same on both units.

• 5 in display, 800H x 480V, 16-bit color
• Beam coverage: 20, 42 and 60 degrees at −10 dB
• Standard sonar depth: 1,200 ft
• Power output: 4,000 W peak-to-peak, 500 W RMS
• Current draw: 615 mA
• Input: 10.8–20 VDC
• Internal GPS with Humminbird Basemap, 10,000-plus lakes plus coastal
• AutoChart Live with eight hours of recording built in
• LakeMaster, CoastMaster and Navionics chart compatibility
• Gimbal dimensions: 7.55 W x 4.64 H x 3.3 D in
• Full-mode CHIRP span: 150–220 kHz

That is the screen, the processor’s navigation feature set, the power budget, the physical footprint and the mounting hardware. The same case goes on the same bracket and draws the same current from the same battery.

The published differences, in one table

Both columns are read from the retailer specification pages linked at the bottom of this page. Where one retailer publishes a figure and the other does not, the table says so rather than filling the gap.

Eleven rows of specification and only four of them describe the head unit at all. The rest is the thing on the end of the cable.

The transducer is the product

This is the useful general lesson, and it applies far beyond these two boxes.

A fish finder is a screen, a processor and a transducer. The screen decides how well you can see the data. The transducer decides what data exists at all. Everything Humminbird calls “DI” on this model is a different lump of ceramic on the transom, and the head unit simply knows what to do when it is plugged in.

That is why the price step between these two is so small, and it is also why the step from either of them to a MEGA imaging unit is so large — that jump buys a genuinely different transducer and a bigger screen to put the picture on. Our installation page makes the same point from the other end: the transducer mount is the whole job, and a good unit with a badly mounted transducer shows you nothing.

What Down Imaging actually shows, and what it does not

Down imaging is a high-frequency, very thin beam that produces a near-photographic slice of what is directly under the boat. At 455 kHz it resolves individual branches on a laydown, the posts under a dock and the edge of a weed line.

What it is good at: telling cover from fish. On 2D CHIRP a crappie sitting in a brush pile is an arch inside a mess. On down imaging it is a dot beside a branch.

What it is bad at: depth and speed. The published 350 ft ceiling is a third of the standard sonar range, high frequency loses energy quickly in water, and the thin beam means you see less to each side of the boat than 2D does. Our sonar types page works through the trade in detail.

What it is not: side imaging, and not live sonar. It looks down, not out, and it draws history as you move rather than showing the present. If what you actually want is to watch a lure fall next to a fish, that is a different and much more expensive category — our live sonar comparison covers what that really costs.

The 350 foot ceiling, and who it genuinely rules out

Almost nobody, on the water this site is written for.

Most freshwater fishing in the United States happens in under 60 ft, and a great deal of it in under 25. A 350 ft imaging ceiling is not a constraint on a reservoir, a river, a pond or any natural lake outside a short list of deep ones.

It matters if you fish deep natural lakes, mountain reservoirs or the Great Lakes offshore, where you may be marking fish at depths the DI channel simply cannot reach. In that case the 2D unit’s published 3,000 ft option with an optional 50 kHz transducer is the only figure in this comparison that speaks to your problem.

For everyone else, the 1,200 ft standard sonar on both units is already far more than the water holds.

The CHIRP mode difference, which nobody mentions

Here is the part of this comparison we cannot close honestly, and it is worth stating plainly rather than glossing.

Rogers publishes the 2D unit’s Dual Spectrum CHIRP as narrow 180–240 kHz, wide 140–200 kHz and full 150–220 kHz. L&M publishes the DI unit’s as 83/200 kHz with spans of 75–155 and 130–250 kHz, plus the same full 150–220 kHz mode.

Those are different descriptions of the same feature name, from two different retailers. The DI set includes a low-frequency 83 kHz span that penetrates deeper and covers wider; the 2D set includes a narrow 180–240 kHz band that separates targets more finely. We do not know whether that reflects a real difference in what the two transducers can do or simply two shops writing their spec tables differently, and Humminbird does not publish a figure that resolves it.

What that means for you: not much, practically. Both units publish the same beam angles, the same power and the same full CHIRP mode, which is the mode most people leave the unit in. We mention it because it is the one row in the table where the pair might not be identical under the plastic, and pretending otherwise would be the easy thing to do.

Which one, by the water you fish

Brush piles, docks, laydowns, standing timber. The DI, without hesitation. This is the exact job down imaging exists for, and it is most of crappie and bass fishing.

A first fish finder, by someone still learning to read sonar. The DI. The imaging view is readable on day one and the 2D view is not, and a screen you can read is the one you will actually use. Our beginner fish finder page makes the same argument at more length.

Trolling open water for walleye or suspended fish. Either, and the 2D unit costs less. You will be reading the 2D screen regardless; down imaging shows you a thin strip directly under the hull, which is not where the fish you are trolling for are.

Deep natural lakes and reservoirs. The 2D unit, specifically for the published 3,000 ft option.

Ice. Either works, and neither is ideal. Our flasher against fish finder page explains why a flasher still wins for vertical jigging, and our ice electronics page covers the conversion kit you would need either way.

If you want side imaging too. Neither. That is a different transducer and a bigger screen, and it starts at the HELIX 7 MEGA SI. Our under $1000 page covers that bracket.

What neither of them publishes

Three gaps, stated because they are the figures a buyer would want and cannot get.

Screen brightness in nits. Neither retailer publishes it. On a 5 in screen in open sun this is a real question, and both competitors on our HELIX 5 against Eagle 7 page publish 1000 nits where Humminbird publishes nothing.

An IP water-ingress rating. Not published for either unit on the pages we read. On a boat, that is not a trivial omission.

Waypoint capacity on the DI model. Rogers publishes 2,750 waypoints, 45 routes and 50 tracks for the 2D unit. L&M publishes no equivalent for the DI. They are the same head unit and the figures are almost certainly the same, but we are not going to assert a number that nobody printed.

You will also need a battery and a mount, neither of which comes with either unit. Our fish finder battery page does the amp-hour arithmetic on that 615 mA draw, and if you are rigging a small boat, a mounting arm and transducer bracket is the other thing to budget for.

The honest summary

These are the same fish finder with two different transducers in the box, sold a short step apart. For the overwhelming majority of freshwater anglers the imaging channel is worth that step, and for the small number who fish very deep water or troll open basins it is not.

What should not happen is anyone agonizing over it. The screen, the GPS, the mapping, the power and the mounting are the same unit, so whichever you buy, you have bought the same machine.