Piper ARCHER III Pilot Operating Handbook page 242

SECTION 9
SUPPLEMENT 7
SECTION 1 - GENERAL
The GNS 430 System is a fully integrated, panel mounted instrument, which
contains a VHF Communications Transceiver, a VOR/ILS receiver, and a
Global Positioning System (GPS) Navigation computer. The system consists
of a GPS antenna, GPS receiver, VHF VOR/LOC/GS antenna, VOR/ILS
receiver, VHF COMM antenna and a VHF Communications transceiver. The
primary function of the VHF Communication portion of the equipment is to
facilitate communication with Air Traffic Control. The primary function of the
VOR/ILS Receiver portion of the equipment is to receive and demodulate
VOR, Localizer, and Glide Slope signals. The primary function of the GPS
portion of the system is to acquire signals from the GPS system satellites,
recover orbital data, make range and Doppler measurements, and process this
information in real-time to obtain the user's position, velocity, and time.
Provided the GARMIN GNS 430's GPS receiver is receiving adequate usable
signals, it has been demonstrated capable of and has been shown to meet the
accuracy specifications for:
VFR/IFR enroute, terminal, and non-precision instrument approach
(GPS, Loran-C, VOR, VOR-DME, TACAN, NDB, NDB-DME,
RNAV) operation within the U.S. National Airspace System in
accordance with AC 20-138.
North Atlantic Minimum Navigation Performance Specification
(MNPS) Airspace in accordance with AC 91-49 and AC 120-33.
Navigation is accomplished using the WGS-84 (NAD-83) coordinate reference
datum. Navigation data is based upon use of only the Global Positioning
System (GPS) operated by the United States of America.
REPORT: VB-1611
9-42
PA-28-181, ARCHER III
ISSUED: JULY 12, 1995
REVISED: NOVEMBER 6, 1998