Functionality in the areas:
- Readability
- Operability
- Accuracy
- Power reserve
Resistance in the areas:
- Water resistance
- Temperature change
- Ambient pressure
- G-loads
- Vibrations
- Shock and impact resistance
- Liquids typical of flight operations
- Magnetic fields
Security and compatibility in the areas:
- Magnetic signature
- Glare
- Compatibility with cockpit lighting & night vision devices
- Strap attachment