How does Highest Point, Clearance, and First Strike work in the Terrain profile view?

In the Terrain Profile view, you will see values for Highest Point, Clearance, and First Strike. 

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Image 1. Highest Point, Clearance, and First Strike are shown in the Terrain Profile view.

The Highest Point value is the highest point in MSL of any point along your route within the corridor width you have set. 

The Clearance value is calculated for climb, cruise, and descent along your route within the corridor you set but excludes that flight portion that is within 5 nm of your departure and destination airports.

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Image 2. Clearance is calculated for climb, cruise, and descent within your selected corridor width along your route except for within the 5 nm exclusion area.

For flights over relatively flat terrain, the calculated lowest Clearance value may be a point along your route where the climb or descent profile crosses the 5 nm exclusion area around the departure or destination airport. 

Also, the app uses the current winds (for your ETD + trip length) from our Global Winds Model combined with your selected aircraft performance profile to calculate how quickly the aircraft climbs and descends. Therefore, Clearance will vary based on wind forecasts.

The First Strike point is calculated along your route within the corridor you set but excludes that flight portion that is within 1 nm of your departure and destination airports.

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Image 3. First Strike is calculated for climb, cruise, and descent within your selected corridor width along your route except for within the 1 nm exclusion area.