NavFn Planner Basics and When to Use It

Source: ros2-copilot-skills NavFn planner skill

Why This Matters

Global planning does not always need to be fancy. NavFn remains useful because many robots operating on a 2D occupancy map simply need a reliable freespace planner with modest complexity and predictable behavior.

Distilled Takeaways

• NavFn is a strong fit for standard 2D global planning on static or slowly changing maps.
• It is often easier to understand and deploy than more advanced planners.
• Planner choice should reflect map structure and robot motion model, not just feature lists.
• Simpler planning is often preferable when the local controller and environment do not demand more.

Practical Guidance

• Start with NavFn when the robot is basically differential-drive and the map representation is conventional 2D costmap space.
• Compare against SMAC or Theta* only when there is a concrete planning limitation to address.
• Keep global costmap quality high, because even a straightforward planner inherits whatever map quality you give it.
• Do not blame the planner for problems caused by bad localization or costmap inflation.

Corroborating References

• Nav2 planner plugins docs
• Nav2 tuning guide

When to Read the Original Source

Go to the original skill when you want NavFn-specific configuration guidance and comparison notes against the other global planners in the Nav2 ecosystem.