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Getting Started
Initializing the Receiver
To graphically initialize the GPSMAP 188/188C/238 Sounder:
1. Press the MENU key twice for the Main Menu. Press Up or Down on the ARROW KEYPAD until
the ‘GPS’ tab is highlighted, then press the MENU key once.
2. Using the ARROW KEYPAD, highlight ‘Initialize Position’ and press ENTER to initialize the
receiver from the map. The Initialize Position Page appears, prompting you to select your
approximate location with the map cursor.
3. Use the ARROW KEYPAD to move the map cursor and point to your approximate location within
200 miles. If you have diffi culty identifying your position, press and release the IN key to see the
next lower map scale.
4. Once you have determined your approximate location on the map, press the ENTER key.
NOTE: This does not “calibrate” the unit in any way, but rather helps to speed up the
initial satellite acquisition. If the unit displays “Ready (2D) or (3D )” during this
process, it is not necessary to initialize the unit.
The GPSMAP 188/188C/238 Sounder will now begin searching for the appropriate satellites for
your region and should acquire a fi x within a few minutes. When viewing the ‘GPS’ tab on the Main
Menu, a signal strength bar for each satellite in view appears on the bottom of the page, with the
appropriate satellite number under each bar. The progress of satellite acquisition is shown in three
stages:
No signal strength bars— the receiver is looking for the satellites indicated.
Hollow signal strength bars— the receiver has found the indicated satellites and is collecting data.
Solid signal strength bars— the receiver has collected the necessary data and the satellites are ready
for use.
Once the receiver has collected information from at least three satellites, the top of the screen
displays either “Ready (2D or 3D)”, and the GPSMAP 188/188C/238 Sounder is ready for use.
Point to your approximate
location and press
ENTER/MARK.
A satellite’s strength bars
turn green when it’s ready
for use.
,
188188C238 Manual Part 1.indd 3 6/30/2003, 3:34:20 PM
13


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