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6-6
6.2.4 DOWNLOAD TRACK DATA
A track log is downloaded into an ASCII file (with extension “.TRK”) in the
format described in Section 6.1. It includes one header record (H record)
followed by multiple “track” data records (T records). Each line of position file
data begins with the track record identifier (T), followed by latitude and
longitude (or easting and northing for grid coordinates), date (in DD-MMM-
YY format) and time (UTC in HH:MM:SS format) recorded, and altitude. An
example of a track file (using UTM/UPS coordinates) follows:
6.2.5 DOWNLOAD ALMANAC DATA
Select “Almanac Data” to download stored almanac data from the GPS unit
into a YUMA formatted ASCII file with an “.ALM” extension. Upon choosing
this selection, a dialog box will prompt you for the required information (drive,
directory and file name). Indicate the destination file name for the almanac
data.
The file created will contain almanac data for each of the currently operational
satellites. While the data is transferring, a bar graph will monitor the rate of
the data transfer.
You
must
download almanac data before running the SkyView or Bar Chart
options on the SatVis Menu described in Chapter 9 (or any third-party
planning software). For best performance, satellite almanac data should be
under one month old.
An example of the information contained in the file (for one specific satellite)
follows. Note that the same block of information is repeated for each
operational satellite.
H SOFTWARE NAME & VERSION
I PCX5 2.00
H R DATUM IDX DA DF DX DY DZ
M E WGS 84 100 +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00 +0.000000e+00
H COORDINATE SYSTEM
U UTM UPS
H ZONE EASTING NORTHING DATE TIME ALT ;track
T 15S 0345695 4312736 23-MAR-94 09:31:58 -9999
T 15S 0345652 4312736 23-MAR-94 09:32:00 -9999
T 15S 0345594 4312738 23-MAR-94 09:32:02 -9999
T 15S 0345551 4312738 23-MAR-94 09:32:04 -9999
T 15S 0345493 4312740 23-MAR-94 09:32:06 -9999
T 15S 0345435 4312741 23-MAR-94 09:32:08 -9999