Garmin GPS 17HVS - Receiver Module Installation Manual - Page 14

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GPS 17

SING THE

The ﬁrst time you turn on your GPS 17, the receiver must be

given an opportunity to collect satellite data and determine

its present position. To ensure proper initialization, the GPS

17 is shipped from the factory in AutoLocate

allows the receiver to "ﬁnd itself" anywhere in the world.

When turned on, the GPS 17 searches for satellites. After

it has calculated an initial position ﬁx, the GPS 17 outputs

navigation data. For more information about the data

output by the GPS 17, refer to the GPS 16/17 Technical

Speciﬁcations located on the Garmin Web site.

The GPS 17 can receive WAAS (Wide Area Augmentation

System) satellite signals. WAAS is an FAA-funded project

to improve the overall integrity of the GPS signal and

increase position accuracy for users in North America.

The system is made up of satellites and approximately

GPS 17

mode, which

25 ground reference stations positioned across the United

States that monitor GPS satellite data. Two master stations,

located on either coast, collect data from the reference

stations and create a GPS data correction message. Initial

reception of the WAAS signal may take up to 20 minutes.

According to the FAA's Web site, testing in September 2002

of WAAS conﬁrmed an accuracy performance of 1–2 meters

horizontal and 2–3 meters vertical throughout the majority

of the continental United States and portions of Alaska. For

more information, go to

http://gps.faa.gov/Programs

/WAAS/waas.htm.

WAAS is just one service provider that adheres to the

minimum operational performance standard for global

Satellite Based Augmentation Systems (SBAS). Eventually,

there will be several services of worldwide geostationary

communication satellites and ground reference stations.

All SBAS systems use the same receiver frequency and are

capable of providing your GPS unit with increased accuracy

at any location in the world.

GPS 17 Installation Guide