PASCO PS-2175 GPS Position Sensor - Manual (Page 6)

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G P S P o s i ti o n S e n s o r Se n s o r D a ta
6
Sensor Data
The sensor simultaneously reports several different measurements. When the GLX
records data, it records all of these measurements, even if they are not displayed. The
measurements are described in Table 2.
Data Collection
Whenever it is powered on, the Position Sensor continuously receives (or attempts to
receive) data from GPS satellites, even if data is not being recorded by the GLX. The
sensor uses the satellite data to calculate latitude, longitude, and the other quantities
listed in Table 2. These measurements are reported to the GLX.
If the sensor is not actively tracking satellites, it still reports data to the GLX. Use this
data with caution. In initial search mode (flashing red), it reports latitude and longi-
tude values of zero. In GPS lost mode (flashing red and green), it reports the last valid
measurements.
To record data:
1. Press on the GLX. By default, the GLX records data at its maximum rate of
once per second and displays Latitude and Longitude (in decimal degrees) in the
Digits display.
2. To stop recording, press again.
To record another run of data, repeat steps 1 and 2.
If you want to observe your current position without recording data, the steps above are not nec-
essary. The Digits display always displays a live reading.
Table 2: Measurements
Measurement 1 Range Resolution Notes Example 2
Latitude ±90.000000° 0.000001° (~2 m)
Global position appropriate for My World and
other mapping applications
38.803772°
Longitude ±180.000000° 0.000001° (~2 m) -121.316544°
Altitude 0 to 18000 m 1 m 34 m
Horizontal speed 0 to 515.00 m/s 0.01 m/s 1.07 m/s
Course over ground 0 to 360° 0.01° North: 0°
East: 90°
South: 180°
West: 270°
Reliable when the Position Sensor is moving
24.74°
Satellite Count 0 to 20 1 Number of satellites that the Position Sensor
is actively tracking 5
Latitude Relative ±10000 m ~0.2 m Relative displacement from location at the
start of data recording; origin is reset each
time a new data run starts 2.3
Longitude Relative ±10000 m ~0.2 m 1.8
Latitude Minutes 0 to 60.0000' 0.0001' (~0.2 m)
Minutes within the current degree
48.2271'
Longitude Minutes 0 to 60.0000' 0.0001' (~0.2 m) -18.9935'
1 See specifications on page 11 for accuracy information.
2
Example data acquired at 38° 48.2271´ north latitude, 121° 18.9935´ west longitude, walking north-northeast.