Garmin GPS 38 User Manual download pdf (Page 9)

Initializing Your GPS for First Time Use

The GPS 38 calculates your position and movement by

tracking signals sent from GPS satellites. Each of the 24

GPS satellites circle the earth twice a day in a very precise

orbit, and transmit information back to earth. In order to

determine a position fix, your GPS receiver needs to contin-

uously “see” at least three satellites.

Because a GPS receiver can only see satellites above the

horizon, it needs to know what satellites to look for at any

given time. By using an almanac (a timetable of satellite

numbers and their orbits) stored in the receiver’s memory,

the GPS 38 can determine the distance and position of any

GPS satellite.

To use this almanac data, your GPS needs to know

where you are, or be given the opportunity to “find itself”.

Once you initialize the unit to this position, the GPS 38

will usually compute a fix within a few minutes.

Remember, this process is only necessary under the

following conditions:

• First time use from the factory.

• The receiver has been moved over 500 miles from

the last calculated position with power off.

• The receiver’s memory has been cleared and all

stored data has been lost.

G E T T I N G

S TA R T E D

Initialization

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Garmin GPS 38 User Manual Page 9