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Using GPS 55
Using GPS
The GPS Applications Menu
Clicking the arrow to the right of the icon opens the GPS Applications menu. This
menu can be used to quickly launch applicatio
ns that require GPS input (such as mapping
utilities and other location-based applications).
By default, there are no applications listed her
e, but you can add GPS applications to the
menu in the GPS Applications window. (See “Adding a GPS Application to the GPS
Applications Window” on page 58 for more information.)
GPS Data Fields
The following data fields appear on the Location/GPS tab of the Settings window and in the
menu that appears when you hover over the GPS icon in the main window:
●
Number of Satellites
–
The number of satellites your GPS receiver has acquired. At
least three are required to provide latitude and longitude and four are required to
provide an altitude. Additional satellites provide greater accuracy (seven or more is
considered excellent).
●
HEPE – Horizontal Estimated Position Error. This is a measure of the accuracy of your
calculated position. So, if the HEPE is 43 feet, you could be as much as 43 feet from
the coordinates indicated by your device’s GPS receiver.
●
Latitude – Your current latitude, expressed in degrees and rounded to four decimal
places. Positive numbers are used for locations north of the equator. Negative
numbers are used for locations south of the equator. Zero is the equator itself.
●
Longitude – Your current longitude, expressed in degrees and rounded to four
decimal places. Positive numbers indicate locations east of the Prime Meridian
(which passes through Greenwich, England). Negative numbers indicate locations
west of the Prime Meridian.
●
Elevation – Your current altitude above Sea Level (in feet). Note that because of the
inherent difficultly in determining altitude via GPS, the margin of error for altitude may
be larger than the HEPE (the margin of error for latitude and longitude).
●
Speed – The estimated speed at which you are moving.
●
Heading – The approximate direction in which you are moving. Compass headings
range from 0 degrees (due north) to 360 degrees, with 90 being due east, 180 due
south, and 270 degrees due west.
●
GPS Port/NMEA Port – The next available NMEA Port available for use by a GPS
application. Some applications require you to enter this port number.