Which statement is true concerning the handling of obstacles during IFR operations?

The statement that published notes about obstacles must be adhered to for safe navigation is true because these notes provide critical information that ensures safe route planning and navigation during Instrument Flight Rules (IFR) operations. Obstacle data is integrated into charts and navigational aids, allowing pilots to be aware of potential hazards along their flight paths. Adhering to these published notes helps pilots maintain safe altitude levels and avoid obstacles that could pose a risk to flight safety.

This information is especially important in IFR conditions, where visibility may be limited, making reliance on visual observations inadequate for identifying such hazards. While it may be possible to avoid obstacles without notifications in certain flying conditions, such an approach could undermine safety. Visual checks during flight might not always be feasible or reliable, particularly in low visibility. Additionally, obstacles that are relevant in IFR operations remain a concern in VFR operations as well, emphasizing the need for comprehensive awareness and adherence to published obstacle data for all types of flights.