Garmin GPS 125 Sounder - Manual (Page 9)

Getting Started with Your GPS
Welcome to the exciting world of GARMIN GPS!
The GPS 125 Sounder represents GARMIN’s continuing
commitment to provide marine users with quality navi-
gation information in a versatile, user-friendly design
they will enjoy for years to come. To get the most out
of your GPS receiver, be sure to read through the ini-
tialization and Getting Started sections of this manual,
and refer to the reference section for complete details
on the GPS 125 Sounder’s advanced features.
Initializing Your GPS for First-Time Use
The first time you power up your new GPS 125
Sounder is an important step in getting the best possi-
ble future GPS performance.
Because a GPS receiver can only receive signals
from 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 125
Sounder can determine the distance and position of
any GPS satellite and then use this information to
determine your position.
To obtain this almanac data, your GPS receiver
needs to be initialized or given the opportunity to “find
itself”, the very first time it is turned on. Once you
have initialized the unit, the GPS 125 Sounder will
compute future fixes more rapidly, usually in a few
minutes.
Remember, that initializing the unit is only neces-
sary under the following conditions:
• First-time use from the factory
• If the receiver has been moved over 500 miles
from the last calculated position with power
off
• If the receiver’s memory has been cleared and
all stored data has been lost
5
Welcome Page
The welcome page will
appear as soon as the GPS
125 Sounder is turned on
and remain on while the
unit conducts a brief
self-test.
GETTING
STARTED
Initialization
125 Man Rev B 7/23/98 11:47 AM Page 5