A Appendix A
Data View tab
The Data View page allows you to capture and view the GPS data being sent to SatViewer by your
unit’s GPS receiver over the COM port.
There are two formats for data that can be viewed from this screen, depending on if you are running
in NMEA or SiRF Binary mode, as configured in the GPS page.
This feature is:
l useful if you have a need to view or store the raw GPS messages as they come out from your
unit’s GPS receiver in a textual format.
l for advanced GPS users who need the ability to store the raw GPS information as ASCII text in
one large LOG file.
l intended to collect up to several minutes of data. It is not intended for extended data collection
sessions.
When in NMEA mode, the data displayed is simply the raw NMEA codes being sent over the COM
port, which are displayed in their original ASCII format.
When in SiRF Binary mode, the data being sent over the COM port is in binary format, and
therefore must be converted to ASCII text before it can be displayed in a useable format. This
involves converting each binary message to hexadecimal text, and adding a text tag to each
message that explains what type of message it is.
Chars
Lists the number of characters captured to the buffer. The maximum amount of characters that can
be stored to the buffer is approximately 64,000 characters. A “% full” indicator for the used buffer is
provided for your convenience.
Capture
Begins capturing the data passing over the COM port and storing it to a buffer.
Ranger Series Handheld Computer 71
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