Sonar & Maps: 2D Traditional CHIRP & Down View Sonar

Why do anglers often put 2D CHIRP Sonar and Down View (Down Imaging / DownScan / ClearVü) side by side on a split screen? Because each one sees what the other misses!

Feature2D CHIRP Sonar (传统 2D 圆锥声呐)Down View (高清下扫扇形声呐)
Beam ShapeWide ice-cream cone (15°–24° angle) covering a circle on the bottom roughly 1/3 as wide as the depthRazor-thin front-to-back slice (like a photocopy scanner beam) directly beneath the boat
How Fish LookClassic boomerang arches (鱼弧) when moving through the cone, or horizontal spaghetti lines when sitting stillSmall bright dots or football specks (never arches, because the beam is paper-thin!)
How Cover LooksFuzzy blobs—a brushpile looks like a messy cloud, making it hard to tell branches from fishNear-photographic clarity—you can count individual tree limbs, bridge pilings, boulders, and weed stalks
Best SuperpowerReading bottom hardness (底质软硬), spotting fish arches hugging the bottom, and vertical drop-shottingDistinguishing rock vs wood vs grass and seeing if fish are buried inside a tree

How to Read Bottom Hardness and Fish on 2D & Down View

  • Hard Bottom (Rock / Gravel / Mussel Shell Bed): Reflects a huge echo! On 2D, the bottom line is thick, bright yellow/red/orange, and often shows a "Second Echo" (二次回波)—a faint second bottom line at 2× the depth. On Down View, rocks glow bright white/gold.
  • Soft Bottom (Mud / Silt / Muck): Absorbs sound! The bottom line looks thin, fuzzy, and dim.
  • Why Fish Arches Turn Into Flat Lines: An arch happens only because the distance between the fish and transducer changes as the boat drives over it (far at the edge of the cone → closest in the center → far again). When you stop the boat on Spot-Lock, a fish sitting under you draws a flat horizontal stripe! And if your drop-shot sinker drops straight down as a vertical line and that horizontal fish stripe rises to meet it—set the hook!

Top 10 en cuatro mercados

Estados Unidos

  1. Humminbird MEGA Down Imaging+ Transducer (XM 9 HW MDI T) — $299. 1.2MHz MEGA frequency provides photographic clarity of bottom cover down to 400 feet.
  2. Garmin GT56UHD-TM Ultra High-Definition Transducer — $449. High-wide CHIRP traditional sonar with 800kHz/455kHz ClearVü down imaging; exceptional bottom definition.
  3. Lowrance Active Imaging HD 3-in-1 Transducer — $399. High-frequency CHIRP with 1.2MHz DownScan imaging; FishReveal highlights targets on structure.
  4. Airmar TM185M High-Performance Chirp Transducer — $899. 1kW single-band medium CHIRP (85-135kHz); unparalleled deep-water target separation down to 1,500ft.
  5. Raymarine HV-100 HyperVision All-in-One Transducer — $349. 1.2MHz HyperVision CHIRP DownVision delivers near-photographic image quality of underwater terrain.
  6. Garmin GT54UHD-TM All-In-One Transducer — $299. Ultra High-Definition ClearVü provides crisp images of structure and fish below your boat.
  7. Airmar TM150M Medium CHIRP Transducer — $329. 300W medium CHIRP (95-155kHz); wide beam covers large area under boat with pristine arc separation.
  8. Humminbird Dual Spectrum CHIRP Transducer — $129. Offers Wide Beam for maximum coverage and Narrow Beam for maximizing detail and target separation.
  9. Lowrance HDI Skimmer 83/200 & 455/800kHz — $149. Proven hybrid dual-imaging transducer combining classic broadband CHIRP with high-res DownScan.
  10. Furuno 525STID-PWD Plastic Transom Mount Transducer — $189. High sensitivity 50/200kHz dual frequency with built-in fast-response water temperature sensor.

Canadá

  1. Humminbird MEGA Down Imaging+ XM 9 Canada — C$419. 1.2MHz MEGA frequency pierces cold northern waters to delineate fish hugging rock bottom.
  2. Garmin GT56UHD-TM Transducer Canada Edition — C$629. High-wide CHIRP provides distinct separation of tight bait balls and schooling walleye.
  3. Lowrance Active Imaging HD 3-in-1 Canada — C$559. 1.2MHz DownScan cuts through deep Canadian weed beds without surface clutter.
  4. Airmar TM185M 1kW Chirp Transducer Canada — C$1,249. Massive 1kW power penetrates 200+ feet depths in Georgian Bay for deep lake trout and bass.
  5. Raymarine HV-100 HyperVision Canada Spec — C$489. HyperVision 1.2MHz frequency reveals individual logs and sunken boulders in northern bays.
  6. Airmar TM150M Medium CHIRP Canada — C$459. High-sensitivity ceramic element marks subtle fish arcs at 30 mph cruising speeds.
  7. Garmin GT54UHD-TM Transducer Canada — C$419. Ultra HD ClearVü provides dependable bottom composition readings in sub-zero waters.
  8. Humminbird Dual Spectrum CHIRP Canada Edition — C$179. Wide and narrow beam switching identifies walleye glued to bottom contours.
  9. Lowrance HDI Skimmer Transducer Canada — C$209. Streamlined hydrodynamic casing prevents turbulence aeration at high speeds.
  10. Furuno Dual Frequency Transom Transducer CA — C$259. Heavy urethane housing resists impact from floating drift logs in Canadian Shield lakes.

Japón

  1. Humminbird MEGA Down Imaging+ XM 9 Japan — ¥42,000. 1.2MHz high frequency captures exquisite weedbed structure on Lake Biwa with photographic fidelity.
  2. Garmin GT56UHD-TM Transducer Japan Spec — ¥62,000. Ultra High-Definition ClearVü displays ultra-thin thermoclines on deep Japanese reservoirs.
  3. Lowrance Active Imaging HD 3-in-1 JP — ¥55,000. FishReveal combines traditional CHIRP arcs with 1.2MHz DownScan on steep reservoir cliffs.
  4. Raymarine HV-100 HyperVision Japan Spec — ¥48,000. Photo-like 1.2MHz resolution isolates individual bass hovering above submerged timber.
  5. Airmar TM150M Medium CHIRP Transducer JP — ¥45,000. High sensitivity broad beam is favored by Lake Biwa deep offshore scouting anglers.
  6. Garmin GT54UHD-TM Transducer Japan — ¥41,000. Dependable down scan performance widely installed on Lake Sagami rental conversion decks.
  7. Humminbird Dual Spectrum CHIRP Japan Spec — ¥18,000. Low-Q ceramic element delivers pristine target separation in high-pressure reservoir waters.
  8. Airmar TM185M 1kW CHIRP Japan Edition — ¥128,000. 1kW deep penetration preferred by Japanese coastal game boats and deep lake guides.
  9. Lowrance HDI Skimmer Transducer Japan — ¥21,000. Compact transducer head fits neatly inside rental boat side brackets without excess drag.
  10. Furuno Dual Beam Transom Mount JP — ¥26,000. Precision Japanese industrial engineering with fast water temperature response.

China

  1. Garmin 佳明 GT56UHD-TM 超高清三合一探头 — ¥3,200. High-wide CHIRP with 800kHz/455kHz ClearVü down imaging; undisputed domestic standard.
  2. Humminbird 蜂鸟 MEGA Down Imaging+ 旗舰下扫探头 — ¥2,450. 1.2MHz MEGA frequency provides photographic clarity of sunken trees, bridges, and fish.
  3. Lowrance Lowrance Active Imaging HD 3-in-1 探头 — ¥2,800. High-frequency CHIRP with 1.2MHz DownScan and FishReveal color highlight on bottom fish.
  4. Raymarine 雷松 HV-100 HyperVision 一体式超清探头 — ¥2,480. 1.2MHz HyperVision CHIRP DownVision delivers astonishing underwater structure detail.
  5. Airmar Airmar TM150M 中频 CHIRP 宽波束探头 — ¥2,300. 300W medium CHIRP with wide beam angle covers massive underwater area for fast scouting.
  6. Garmin 佳明 GT54UHD-TM 超高清下扫侧扫探头 — ¥2,100. Ultra HD ClearVü down imaging delivers crisp images of structure directly below the boat.
  7. Humminbird 蜂鸟 Dual Spectrum 双频 CHIRP 传统探头 — $980. Low-Q ceramic element delivers pristine target separation in high-pressure waters.
  8. Airmar Airmar TM185M 1kW 超大功率深水探头 — ¥6,500. 1kW single-band CHIRP penetrates deep reservoirs with pristine resolution down to 1,500ft.
  9. Lowrance Lowrance HDI Skimmer 经典双频下扫探头 — ¥1,100. Proven hybrid dual-imaging transducer combining broadband CHIRP with DownScan.
  10. Furuno 古野 船尾挂载高敏双频测深测温探头 — ¥1,350. High sensitivity 50/200kHz dual frequency with rapid-response water temperature sensor.

← Contour Lake Mapping & Custom Charting · Side View Sonar Tuning & Structure Identification →

Sonar & Maps

How to read lake contour maps, 2D CHIRP, Down View, Side View, and Forward-Facing Live View—complete with dial-in settings and step-by-step fish-finding image interpretation.

  1. Contour Lake Mapping & Custom Charting
  2. 2D Traditional CHIRP & Down View Sonar
  3. Side View Sonar Tuning & Structure Identification
  4. Forward-Facing Live Sonar Calibration & Fish Behavior

Sonar & Maps