Where is the scanning aircraft's position on a sector PPI?

• A. Bottom center
• B. Center
• C. Top left
• D. Bottom left

Answer: (A)

In a sector PPI, the own-ship symbol is fixed at the bottom center of the display, with the forward direction shown toward the top. This setup lets you read relative bearings and ranges with the aircraft effectively moving upward on the screen as you look ahead into the observed sector. Targets appear around that fixed bottom-centered symbol, with nearer ranges shown by closer rings. The bottom-center placement is chosen to represent a forward-looking view: the sector lies in front of you, so putting your own position at the bottom makes the bearing toward the top (straight ahead) intuitive. Other positions would imply a different orientation (center would suggest a full 360° view with the symbol in the middle), which isn’t how a forward-looking sector display is structured.