User wants me to rewrite an article about portable fish finders to improve clarity, flow, and SEO quality, same language (English), roughly same length, keep same facts/meaning, don’t invent new claims. Return ONLY rewritten article as clean HTML using p, h2/h3, ul/li where appropriate. No commentary, no markdown fences.

Let me analyze the original structure:
1. Title + intro
2. What Is a Portable Fish Finder? (with table)
3. Why Every Angler Needs a Fish Finder Portable Device
4. How a Portable Fish Finder Works
5. Top Types of Portable Fish Finders
6. Best Portable Fish Finders: Detailed Comparisons
7. Fish Finder Portable: Feature-by-Feature Buying Guide
8. Portable Fish Finder Setup: Step-by-Step
9. How to Read a Portable Fish Finder Screen
10. Portable Fish Finders for Specific Fishing Styles
11. Common Mistakes When Using a Portable Fish Finder
12. Portable Fish Finders vs. Fixed Units: When to Choose Each
13. Maintaining Your Portable Fish Finder
14. Fish Finder Portable Price Ranges Explained
15. Environmental Factors That Affect Portable Fish Finder Performance
16. Best Accessories for Your Portable Fish Finder
17. Top Brands in Portable Fish Finders
18. Case Study
19. FAQs
20. Citation
21. Ready to Find More Fish?

I need to rewrite this in clean HTML, preserving facts, improving clarity/flow/SEO. Keep roughly same length. Use h2/h3, p, ul/li. Tables — original had tables, but the instruction says “using

,

/

, and

/
• where appropriate” — no mention of tables. I should convert tables into prose or lists. Since they didn’t mention tables, I’ll avoid tables and use lists or prose paragraphs to convey comparison data.

  Let me rewrite it with improved clarity and flow. Keep all facts, same meaning, same general length. Let me be careful not to invent new claims.

  Let me structure:

  – Title h1? The instruction says h2/h3. I can use h1 for title, or maybe just use strong/p for title. Actually they said “using

  ,

  /

  , and

  /
  • where appropriate” — I’ll use h2 for main sections, h3 for subsections. Title can be h1 or a p. I’ll use h1 for the article title (they didn’t forbid it, but they specified h2/h3 — to be safe I’ll use a

    with strong or an h1? Actually h1 is a heading tag too, and they said “h2/h3” — using h1 seems acceptable for title. But to strictly comply, I’ll use p tag for the title with a strong or just use h1? The instruction says “using

    ,

    /

    , and

    /
    • where appropriate” — this implies those tags. H1 might be okay but they only said h2/h3. I’ll use a p tag with strong for the title, or simply an h1 — risk is low. But to be safe, I won’t use h1. Actually, “clean HTML” with h2/h3 for headings — I’ll make the article title an h2 or a p? Hmm. Let me just use an h2 for the title? That’s weird. I’ll use

      …

      for the title to stay strictly within allowed tags.

      Let me rewrite section by section.

      Original intro:
      “Whether you’re fishing from a kayak, bank, or small boat, a fish finder portable device can completely change your results on the water. These compact sonar tools help anglers locate fish faster, read underwater structures, and make smarter decisions — without expensive, fixed installations.”

      Improved:
      “Whether you fish from a kayak, the bank, or a small boat, a portable fish finder can completely change your results on the water. These compact sonar tools help you locate fish faster, read underwater structure, and make smarter decisions — without costly, permanent installation.”

      Section: What Is a Portable Fish Finder?
      Keep facts: handheld or clip-on sonar device, easy transport, flexible use, no permanent mounting or complex wiring. SONAR technology explanation. Transducer sends sound waves, bounce back, display on screen or smartphone. Quote: “The best fishing tool is the one you actually have with you.” Key differences from fixed units — convert table to list.

      I’ll write:

      What Is a Portable Fish Finder?

      A portable fish finder is a handheld or clip-on sonar device designed for easy transport and flexible use. Unlike built-in units, it requires no permanent mounting or complex wiring.

      These devices use SONAR (Sound Navigation and Ranging) technology. A transducer sends sound waves into the water; when those waves hit fish, rocks, or the bottom, they bounce back, and the device displays the reading on a screen or your smartphone.

      — they didn’t mention blockquote. I’ll put it in a p with quotes.

      Key differences list:
      – Installation: None required vs. professional install needed
      – Portability: Carry anywhere vs. stays on one boat
      – Cost: $30–$400 vs. $150–$2,000+
      – Power: Batteries/USB vs. boat battery
      – Best for: Kayaks, bank fishing vs. larger boats

      I’ll do:

      Here are the key differences between portable and fixed fish finders:

      • Installation: Portable units require none; fixed units typically need professional installation.
      • Portability: Portable units go anywhere; fixed units stay on one boat.
      • Cost: Portables run from $30 to $400; fixed units range from $150 to $2,000+.
      • Power source: Batteries or USB versus a boat battery.
      • Best for: Kayaks, bank fishing, and ice fishing versus larger boats.

      Section: Why Every Angler Needs a Fish Finder Portable Device
      Facts: 49 million Americans fish each year (American Sportfishing Association). Growing number turning to compact sonar. Reasons: versatility, no installation, cost-effective, smartphone integration, travel-friendly. FishBrain 2022 study: 13 million users, anglers using sonar-assisted tools reported up to 30% more successful catch sessions.

      I’ll restructure:

      Why Every Angler Needs a Portable Fish Finder

      Portable fish finders have surged in popularity. According to the American Sportfishing Association, over 49 million Americans fish each year, and a growing number are turning to compact sonar gear to improve their catch rates.

      Here’s why a portable unit makes sense:

      …

      A 2022 study by FishBrain, a popular fishing app with 13 million users, found that anglers using sonar-assisted tools reported up to 30% more successful catch sessions compared to those fishing without electronics.

      Section: How a Portable Fish Finder Works
      Sections: The Sonar Principle, Frequency Matters, Reading the Display.

      Write:

      How a Portable Fish Finder Works

      The Sonar Principle

      The transducer emits ultrasonic pulses into the water. The pulses travel downward, hit objects such as fish, weeds, rocks, or the bottom, and return as echoes. The unit converts those echoes into visual data on a display.

      Frequency Matters

      Frequency determines what you see and how deep you can scan:

      • Low frequency (50–83 kHz): deeper penetration up to 1,000+ feet with a wider beam
      • High frequency (200 kHz): shallower but more detail — great for structure and fish arches
      • Dual frequency: the best of both worlds, showing depth and detail simultaneously

      Reading the Display

      Most portable fish finders show:

      • Fish arches — moving fish appear as curved arches on a scrolling screen
      • Depth readings — exact water depth shown numerically
      • Bottom contour — a line showing the lake or river floor shape
      • Water temperature — many units include a built-in thermometer sensor
      • Fish depth indicators — fish icons with numbers showing how deep fish are holding

      Section: Top Types of Portable Fish Finders
      Facts: 4 types. Keep.

      Top Types of Portable Fish Finders

      Not all portable fish finders are built the same. Choosing the right type depends on where and how you fish.

      1. Castable Fish Finders

      These float on the water surface and are cast out like a lure. They connect wirelessly to your smartphone via Bluetooth.

      Best for: Bank fishing, dock fishing, pier fishing

      Popular models: Deeper PRO+ 2, ReelSonar iBobber, Vexilar SonarPhone SP200

      2. Kayak / Float