Ahrr! Just tell me what to buy! (click on image)
Compact Flash GPS Receivers

These GPS receivers plug into a Compact Flash (CF) socket on Pocket-PC PDAs. There are several companies that sell them, but some of them look so much alike they probably all are manufactured by one company. No matter, they work well.

You can get an external antenna that plugs into a connector on the side of the module. This antenna has a magnetic mount so it sticks to the top of the car. For other applications you may not need the external antenna.

 
Haicom-303E with antenna

Haicom 303 E: This is our favorite CF module right now. It is the Haicom 303E and is the lowest cost CF module that has all of the features we want for GPS2PDA. It also is easy to find.

Here is source to buy the Haicom 303E unit. Make sure you also get the external antenna.

Holux 270: Shown here is a CF module and antenna made by Holux Inc. This is one of the lower cost CF GPS modules we have found that also has all of the features we need for travel time studies. We have one of these and it works very well.

Here is a link to the Holux web site where you can get information about the Holux 270.

Here is source to buy the Holux CF GPS 270 unit shown here. Make sure you also get the external antenna.

Note: Holux also sells a GPS 270 Ultra model, which you would think would be better. We recently found out that the Ultra model does not work as well as the older, and cheaper model. In an effort to improve the sensitivity of the receiver, Holux changed some of the parameters of the design. One result of this change is that the speed data transmitted by the receiver does not respond to changes in speeds of the vehicle very well. It takes several seconds for the speed to "catch up" with the speed of the vehicle when you slow down or speed up. This leads to slightly distorted travel time data.

Pharos iGPS-CF: This is a module made by Pharos, another company with a variety of GPS products. It costs about the same as the Holux 270 shown above. We haven’t actually tested this one but we don’t have any reason to think it won’t work well.

Here is a review of a Pharos iGPS-CF based system that talks quite a bit about the hardware. The discussion of the mapping software may or may not be of interest to you.

Here is a source to buy the Pharos iGPS-CF module and antenna. Make sure you order the external antenna as well.

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