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Legend (SEA/SEA_ALP_2018)

Precision Object Free Zone (POFZ) (1)
Runway Object Free Area (ROFA) (2)
Runway Object Free Zone (ROFZ) (3)
Runway Protection Zone (RPZ) (4)
Runway Protection Zone - Departure (RPZ DEP) (5)
Runway Safety Area (RSA) (6)
Taxiway Edge Safety Margin (TESM) (7)
Taxiway Object Free Area (TOFA) (8)
Taxiway Safety Area (TSA) (9)
Building Restriction Line (BRL) (10)
Departure (DEP) (12)
Glidepath Qualification Surface (GQS) (13)
Part 77 Approach (P77 APP) (14)
Threshold Siting Surface (TSS) (15)
NAVAID Glideslope (17)
NAVAID Localizer (18)