Tips, Tricks and Suggestions from Furuno

Step Up Your Track Line Game With Variable Tracks!

Why Is My Track Line Black Instead of Showing Bottom Discrimination Colors?

Black track lines indicate that Bottom Discrimination data isn’t being received or the feature isn’t fully enabled. The good news is that it's easy to fix. Follow the steps below to ensure your TZtouch3 or TZtouchXL displays accurate, color-coded track lines based on bottom type.

1. Verify Transducer Compatibility and Setup

• Confirm your transducer supports Bottom Discrimination by checking the product manual.

• Ensure the correct transducer is selected in the Fish Finder setup (see your TZtouch model’s                   eGuide under Fish Finder Initial Setup Menu).

2. Set Track Line to Variable Color

• Set the track line to “Variable Color” so it reflects Bottom Discrimination data (Ship and Track →          Variable Color → Bottom Discrimination).

3. Enable Bottom Discrimination Overlay

• Enable the Bottom Discrimination overlay in the Fish Finder screen: swipe up from the bottom,              select Overlays, and turn on Bottom Discrimination.

4. Turn On Track Recording

• Swipe in from the right edge toward the center of the screen and confirm Track Recording is ON            (icon turns yellow when active).

Bottom Discrimination Operating Depth and Speed

• Bottom Discrimination works best between 5 m and 100 m (16 ft to 328 ft). Outside this range,              bottom type classification may be inaccurate or unavailable. For best results, keep vessel speed                below 10 kts and verify proper transducer installation.

Quick Checklist

• Transducer supports Bottom Discrimination and is correctly selected
• Track Line set to Variable Color (Bottom Discrimination)
• Bottom Discrimination Overlay turned ON in Fish Finder
• Track Recording is ON (yellow icon)
• Operating within depth range (5 m – 100 m)
• Vessel speed below 10 kts

Troubleshooting Tip

• If the track remains black, check that depth and bottom type data appear on the sounder screen. If           missing, check transducer wiring and verify setup settings.

If you have any questions, visit our website (www.FurunoUSA.com) and click on "Get Support" then "Ask a Question." You may also contact a Furuno support technician at either our Camas, WA facility (360) 834-9300 or our Denton, MD facility (410) 479-4420. 

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