What does the "3,300" indicate next to 'GS' in the profile view section of an approach plate?

The "3,300" next to 'GS' in the profile view section of an approach plate indicates altitude in feet. In this context, the number represents the vertical positioning of the aircraft during the approach, showcasing the altitude at which a pilot should be when following that specific segment of the approach. This altitude is critical for maintaining safe and efficient descent and alignment with the runway, ensuring that the aircraft is operating within the required vertical limits as it descends toward the approach and landing.

Understanding the altitude is essential for pilots to comply with regulations and ensure safety by avoiding obstacles and controlled airspace. The other options do not pertain to this context as they refer to different aspects of flight operations and navigation.