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Appendix C – Tested GPS Devices

Within the WhirlWind build, developers have wrapped within the open-source

software “gpsd”. Gpsd is a daemon that monitors one or more GPS devices

attached to the computer through the USB or serial ports. Multiple GPS client

applications can share access to GPSes without contention or loss of data. As

of this printing, gpsd version 2.34 is being used.

Developers and other contributors of gpsd have put together an extensive

listing of GPS devices and their chipsets that have worked with various versions

of GPSD. This listing may be found at http://gpsd.berlios.de/hardware.html.

The following table illustrates the GPS Devices that have been tested by

WhirlWind developers.

Manufacturer Model Connection

Type

Readable

GPS

Information

Notes

DeLORME Earthmate

LT-20

USB No No detection or

response

Garmin eMap Serial to

USB

Yes Generic NMEA

4899 8N1

Garmin GPSmap

76S

USB to

Serial

Yes 4800 Baud GPS

Device over serial

line

GlobalSat BU-353 USB Yes Sporadic misreads

And

Solid performer

See Below

Pharos GPS-360 USB Yes

Table - 3 Tested GPS Devices

During testing of USB GPS devices, it was found that devices that looked to be

identical, performed radically differently. The key difference was in the

firmware present in the device.

This value, among others, can be seen in the display of the “cgps” program

running on Console #9. This display is present to simply display activity of the

GPS. This program receives the very same data as Kismet.

The specific device was labeled “BU-353”. It is a black disc, just over 2 in. in

diameter with beveled edges, with a grey label on the top.

One of these devices had a serial number “BUW19603” and a

“cold fix” at startup would take 1.5-2 minutes.