Get on the caster–target line: close behind or close in front of the caster, not off to the side. Tracking is the lateral path of the rod tip, and a side view looks along that error — a rod tip swinging left or right appears to travel straight. Task 19 says it plainly: tracking, hooking and casting across the anchor are difficult to see in a side view from the caster, so move around for a view close to in front of or behind the caster.

What you are looking for is a rod tip that curves sideways, producing loops that leave the plane. Move safely while you do it: from behind you are looking up the back cast, and from the front the delivery comes at you, so stay out of the plane of the line and watch the tip against the target line, not just where the line lands.

If you still cannot see it, ask the student to cast again; Task 19 allows that within reason. The fix to teach is keeping the reel in one plane and pointing at the target through the whole casting cycle.

Source

From the CI Study Guide (2025) (PDF) — Task 19; terms from the FFI Fly Casting Definitions (Tracking).