diff --git a/track.h b/track.h
index 05f264f..08ac084 100644
--- a/track.h
+++ b/track.h
@@ -200,6 +200,8 @@ struct aircraft {
     unsigned      nac_v : 3;      // NACv from airborne velocity or opstatus
     unsigned      sil : 2;        // SIL from TSS or opstatus
     sil_type_t    sil_type;       // SIL supplement from TSS or opstatus
+    unsigned      gva : 2;        // GVA from opstatus
+    unsigned      sda : 2;        // SDA from opstatus
 
     int           modeA_hit;   // did our squawk match a possible mode A reply in the last check period?
     int           modeC_hit;   // did our altitude match a possible mode C reply in the last check period?