Whenever your GPSMAP is operating with
a DGPS beacon receiver, the position window
will be replaced by a beacon receiver status
window. This window will display the beacon
receiver status, the signal-to-noise ratio (SNR),
and the distance from your beacon receiver to
the DGPS transmitter.( If available)
GPSMAP 215/225 units purchased without the
internal beacon receiver can be upgraded to
DGPS accuracies using the GARMIN GBR 21
or GBR 23 beacon receiver.
16
The Satellite Status Page also shows receiver status and the current horizon-
tal accuracy at the top left of the screen. The operating mode field will indicate
whether the receiver is acquiring satellites, or is in simulator, 2-D, 2-D
differential, 3-D or 3-D differential mode; with the current dilution of
precision (DOP) and estimated position error (EPE) displayed below.
DOP is a measurement of satellite geometry quality, measured on a scale of
one to ten (lower numbers being the best, higher numbers the poorest). The
EPE uses the DOP and other factors such as signal quality to calculate a
horizontal position error in feet or meters.
At the top right of the screen, your present position and the current date and
time are displayed in the position window. The position shown will be the
receiver’s last calculated position. If you have moved more than 300 miles from
your last position, you may want to enter a more accurate position to speed up
satellite acquisition (or select AutoLocate™ mode, as described on page 48).
You may enter your own position coordinates—by data entry or graphically—
whenever the GPSMAP is acquiring satellites or is in simulator mode.
To enter new position coordinates by data entry:
1. Highlight the position field and press the
C
key to begin data entry.
2. Use the
K
keypad to enter the new position, pressing the
C
key after
each character is selected.
To enter new position coordinates graphically:
1. Press the SET POSN softkey.
2. Use the
K
keypad to move the cursor to the desired position on the map
display and press the
C
key.
3. Press the EXIT softkey to return to the Satellite Status Page.
SECTION
1
SATELLITE
STATUS PAGE
Setting Initial Position
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