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3-3
To manually scroll through the visible satellite list...
· Use an arrow key to move the cursor under the satellite identifier.
· Press MORE to view each visible satellite’s information.
· Press ENT to remove the cursor and return to automatic mode.
3.3 PRESENT POSITION
Altitude
Latitude
Longitude
POSITION PAGE
The Position Page may be displayed by pressing the NAV key. This page
displays your latitude and longitude relative to the selected earth datum (see
Section 4.11). The altitude displayed is the elevation above mean sea level
(MSL); it is NOT equivalent to the altitude displayed on pressure altimeters
in aircraft and should not be used for vertical navigation. The displayed
altitude is typically less accurate than latitude/longitude due to the arrangement
of the orbiting satellites.
When the GPS 55 is performing 2D navigation, the last known altitude will be
used in the latitude/longitude computation. If your speed is over 65 knots, the
unit will ask you to update your altitude every ten minutes with the message
“NEED ALT.” If the altitude is not accurate within a few hundred feet, you
should manually enter your altitude.
To change the altitude...
· Press NAV to display the Position Page.
· Use an arrow key to move the cursor under the altitude.
· Enter the altitude. If your antenna is mounted on a high mast, make
sure you add the mast height. (Remember to complete the data entry
by pressing ENT.)
During initial satellite acquisition, the displayed position is the last computed
position stored in the GPS 55. If your position has moved more than 1000
nautical miles with the power off, you may wish to enter a more accurate initial
position to speed up the acquisition process. (You may also change the
position at any time when you are operating in simulator mode.)