What is GSD and LD?

Date:         03 Mar 99 10:19:31 
From:         "John Craig" <fumiko99@earthlink.net>
Organization: EarthLink Network, Inc.
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Does anyone know what GSD (Glide Slope Deviation) and LD (Localizer
Deviation) represent?  How do they appear in a Heads Up Display?

Thanks for any help

John Craig.