Key takeaways
- 7 inches: Adequate for a compact boat or occasional use, but cramped for side imaging plus chart and sonar at the same time.
- 9 inches: The best compromise for most single-console fishing boats. It supports useful split-screen layouts without dominating the helm.
- 10 to 12 inches: Better for interpreting distant targets, running multiple panels, and viewing charts while moving at speed.
- 16 inches or more: Usually unnecessary for a single small boat station unless you need a networked helm with radar, engine data, charts, and several sonar views.
The best side imaging fish finders for most anglers are the Humminbird HELIX 9 MSI+ GPS G4N, Garmin ECHOMAP UHD2 93sv, and Lowrance Elite FS 9 with an Active Imaging 3-in-1 transducer, while larger boats and serious mapping users should step up to the Humminbird SOLIX 10 MSI+ or Garmin GPSMAP 8612xsv.
Side imaging is most valuable when you want to scan broad areas for structure, weed lines, drop-offs, submerged timber, and bait without driving directly over them. The right choice depends less on maximum advertised range than on screen size, transducer placement, chart compatibility, and whether your boat has room for a through-hull, transom, or trolling-motor installation.
Best side imaging fish finders compared
| Unit and suitable transducer | Screen | Side-imaging capability | Mapping and networking | Typical market range | Best fit |
|---|---|---|---|---|---|
| Garmin ECHOMAP UHD2 93sv with GT56UHD | 9 in, 1024 × 600 pixels | UHD side imaging; practical scanning commonly up to about 125–200 ft per side depending on depth, speed, and conditions | Garmin Navionics support, Quickdraw Contours, Wi-Fi | About $700–$1,100 | All-round freshwater use and smaller boats |
| Humminbird HELIX 9 MSI+ GPS G4N | 9 in, 1024 × 600 pixels | Mega Side Imaging+; up to roughly 125 ft per side in many fishing situations | GPS, AutoChart Live, Humminbird LakeMaster compatibility, Ethernet | About $1,000–$1,500 | Anglers who want strong structure detail and straightforward controls |
| Lowrance Elite FS 9 with Active Imaging 3-in-1 | 9 in, 800 × 480 pixels | SideScan with DownScan and traditional sonar; commonly used at up to about 100–150 ft per side | C-MAP, Genesis Live, Ethernet, wireless and trolling-motor integration | About $900–$1,400 | Mixed sonar, charting, and boat-control systems |
| Humminbird SOLIX 10 MSI+ | 10.1 in, 1280 × 800 pixels | Mega Side Imaging+ with a larger, sharper display for interpreting distant targets | LakeMaster, AutoChart Live, Ethernet, advanced networking | About $1,800–$2,600 | Larger boats and frequent structure fishing |
| Garmin GPSMAP 8612xsv with compatible Garmin scanning transducer | 12 in, 1280 × 800 pixels | High-resolution Garmin scanning sonar; range depends on the selected transducer and installation | Navionics, Garmin Marine Network, radar and multiple-display expansion | About $2,500–$4,000 before transducer and charts | Offshore-capable boats and integrated helm systems |
Advertised range is not a promise of equally clear targets. Side imaging detail normally deteriorates as you increase range, especially in deep water, muddy water, heavy vegetation, or when the transducer is mounted too high. Use the figures as operating categories rather than guarantees.
Best choices by boat and fishing style
Best for a small aluminum boat: Garmin ECHOMAP UHD2 93sv
The ECHOMAP UHD2 93sv is a balanced choice for a jon boat, small bass boat, or fishing kayak with enough electrical capacity for a fixed display. Its 9-inch screen gives you a usable split view: side imaging on one portion and chart or traditional sonar on the other. Garmin’s Quickdraw Contours is useful when your lake has limited mapping, while the GT56UHD transducer combines side imaging, down imaging, and traditional CHIRP sonar.
Its main limitation is physical rather than electronic. A 9-inch display still needs a stable console or mounting arm, and the transom-mounted transducer needs clear water flow. On a narrow boat, measure the space behind the seat and around the steering or tiller before buying.
Best for clear structure detail: Humminbird HELIX 9 MSI+ GPS G4N
The HELIX 9 MSI+ is a strong pick for anglers who spend most of their time finding isolated cover, rock piles, creek channels, and brush. Humminbird’s Mega Side Imaging+ presentation is particularly useful at moderate ranges, where trees and hard-bottom edges appear with enough definition to mark accurately.
The HELIX interface is less focused on touch gestures than many newer units, which can be an advantage when operating it in spray or with cold, wet hands. Check the exact package carefully: some bundles include the required transducer, while others are display-only. LakeMaster chart compatibility is valuable in supported waters, but chart coverage varies by region.
Best for a connected boat: Lowrance Elite FS 9
The Elite FS 9 makes sense when your boat already uses Lowrance equipment or when you want sonar, C-MAP charts, wireless functions, and compatible trolling-motor control in one ecosystem. Its Active Imaging 3-in-1 transducer supplies side imaging, down imaging, and conventional sonar without requiring three separate transducers.
The 800 × 480 display resolution is lower than the Garmin ECHOMAP UHD2 and Humminbird HELIX 9 listed above. That does not make the Elite FS unusable, but small side-imaging targets can be easier to inspect on a sharper screen. Choose it for system integration rather than assuming the biggest range number will produce the best picture.
Best for a larger boat: Humminbird SOLIX 10 MSI+
The SOLIX 10 MSI+ earns its place when a 10.1-inch screen, faster access to mapping layers, and network expansion matter more than keeping the installation compact. A larger display makes side imaging easier to interpret while retaining a chart or GPS track beside it. It is well suited to a bass boat, bay boat, or multi-display console used regularly throughout the season.
It also demands more planning. The unit and bracket need a solid mounting surface, and the transducer cable must be routed without tight bends or exposure to abrasion. A display of this class can become expensive once you add a suitable transducer, chart card, networking hardware, and a professionally protected power circuit.
How much screen size do you need?
- 7 inches: Adequate for a compact boat or occasional use, but cramped for side imaging plus chart and sonar at the same time.
- 9 inches: The best compromise for most single-console fishing boats. It supports useful split-screen layouts without dominating the helm.
- 10 to 12 inches: Better for interpreting distant targets, running multiple panels, and viewing charts while moving at speed.
- 16 inches or more: Usually unnecessary for a single small boat station unless you need a networked helm with radar, engine data, charts, and several sonar views.
Resolution matters alongside diagonal size. A 9-inch display with 1280 × 800 pixels can show finer detail than a physically similar screen with 800 × 480 pixels. However, a sharper display cannot compensate for a badly aligned transducer or excessive boat speed.
Transducer compatibility and mounting requirements
Do not choose the display first and assume every side-imaging transducer will work with it. Manufacturers use different connectors, sonar technologies, and software requirements. Confirm that the exact display, transducer, and mounting kit belong to the same compatible family.
- Transom mount: The most accessible option for many aluminum and fiberglass boats. Mount it below the hull’s turbulence line, away from rivets, strakes, trim tabs, and propeller wash.
- Trolling-motor mount: Useful for scanning in the direction of the electric motor, but cable protection and motor rotation need careful attention. A dedicated side-imaging-compatible motor or mounting accessory may be required.
- Through-hull mount: A clean, protected installation for suitable fiberglass hulls, especially on larger boats. It costs more and may require professional installation; it is generally unsuitable for many cored, aluminum, or trailered-hull applications without manufacturer approval.
- In-hull mount: Works only through compatible solid fiberglass and normally reduces or prevents side-imaging performance, so it is not a universal substitute for an external scanning transducer.
Leave enough cable length for service, but do not coil excess cable tightly beside high-current trolling-motor wires. Poor routing can introduce interference or make future transducer replacement unnecessarily difficult.
A practical decision matrix
| Your situation | Recommended direction | Why | What to avoid |
|---|---|---|---|
| Budget-conscious, occasional lake trips | 7- or 9-inch unit with an included all-in-one transducer | Limits extra installation and chart costs | Buying a display-only package and discovering the transducer is separate |
| New to side imaging | 9-inch Garmin ECHOMAP UHD2 or Humminbird HELIX package | Large enough to learn split screens and marking without a complex network | Paying for radar and networking features you will not use |
| Frequent bass or structure fishing | HELIX 9 MSI+ or SOLIX 10 MSI+ | Strong structure-focused imaging and useful mapping workflows | Running maximum range all the time; target detail often suffers |
| Existing Lowrance trolling motor or chart system | Elite FS with a compatible Active Imaging transducer | Keeps controls, charts, and sonar in one ecosystem | Mixing brands without checking networking and transducer compatibility |
| Large helm, long days, multiple displays | 10- or 12-inch networkable unit | Improves readability and leaves room for chart, sonar, and engine data | Mounting a heavy display to a flexible or poorly reinforced panel |
What side-imaging range should you actually use?
Suppose you scan 150 feet to each side while traveling at 4 miles per hour. The theoretical swath is 300 feet wide, or about 0.057 miles. At that speed, you cover roughly 352 feet per minute, so one pass takes about 51 seconds to move across a 300-foot-wide strip. This looks efficient, but the outer portion of the image may not show enough detail to identify small fish-holding objects.
A better workflow is to search at a wider range, then repeat the area at 60 to 100 feet per side once you see a promising return. Slow to roughly 2 to 4 miles per hour for scanning, keep the boat reasonably straight, and mark targets immediately. Speed, boat pitch, water clarity, and bottom hardness all affect the useful range.
Ownership issues buyers often overlook
The transducer is usually the first component exposed to damage. Trailer bunks, submerged logs, rocks, pressure washing, and careless beaching can crack its housing or bend its bracket. Rinse salt and mud with fresh water, wipe the face clean with a soft cloth, and inspect the cable where it exits the transducer. Do not use abrasive pads or solvent cleaners.
Electrical problems are also common. A display that reboots under trolling-motor load may have undersized wiring, a weak battery, a corroded fuse holder, or a poor ground—not a defective sonar unit. Use the manufacturer’s recommended fuse and wire size, seal exterior connections, and keep sonar power wiring separate from noisy motor cables where possible.
Finally, chart subscriptions, regional map coverage, mounting hardware, and a protective cover can add a meaningful amount to the purchase. For many anglers, a dependable 9-inch package installed correctly is more useful than a premium display operated from a loose bracket with an incorrectly positioned transducer.
Bottom line
Choose the Garmin ECHOMAP UHD2 93sv for a capable, compact all-round setup; the Humminbird HELIX 9 MSI+ for structure-focused freshwater fishing; the Lowrance Elite FS 9 when ecosystem integration matters; and the Humminbird SOLIX 10 MSI+ or Garmin GPSMAP 8612xsv when you have the boat space and budget for a larger networked helm. Prioritize a compatible transducer and a clean installation before paying extra for the longest advertised imaging range.
