Shows if you have been spotted and how much time remains before an enemy fully detects you.
For players seeking a complete visual guide to the game's campaign, multiple resources are available: Sniper Ghost Warrior [PAL][NTSC-U][ISO]
Pay attention to the Wind Sensor (showing direction and strength) and the Pulse Sensor (higher pulse makes steady aiming more difficult). Shows if you have been spotted and how
Your accuracy drops while moving. You can improve it by crouching or lying prone, which also helps you stay hidden in bushes or tall grass. You can improve it by crouching or lying
Use the mini-map to track enemy positions and always move carefully toward cover when the visibility indicator begins to rise. Walkthrough & Mission Guides
For a direct look at gameplay without distractions, you can view the Full Game Walkthrough on YouTube which covers all missions and stealth sections.