| A visual aid that provides guidance information to help a pilot acquire and maintain the correct departure track when departing from an aerodrome or an airport |
| A visual aid that provides guidance information to help a tower controller acquire and maintain the correct approach to an aerodrome or an airport |
| An instrumental aid that provides guidance information to help a pilot acquire and maintain the correct approach to an aerodrome or an airport |
| A visual aid that provides guidance information to help a pilot acquire and maintain the correct glidepath to an aerodrome or an airport |
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