Garmin GNS 530 WAAS GNS 530W comes with built-in WAAS navigation capabilities. It is approved to fly LPV ?glideslope? approaches without reference to ground-based navaids of any kind. Featuring an advanced 15-channel receiver capable of five position updates per second, GNS 530W meets the FAAs stringent TSO C146a standards for WAAS sole means navigation.