1. First of all, check the compatibility of the GPS receiver with the OS on your netbook. Different GPS receivers have their own operating systems that may create conflicts with the one existing on your netbook.
2. Check the availability of the service in your area. Most of the regions (Asia, Africa, and Middle-East) still lack the proper infrastructure to support GPS, and this may lead to incorrect GPS measurements.
3. Check the antenna of the GPS receiver for netbooks. As it will not always be possible for you to get a window seat while traveling, the antenna should be able to receive data even on the weakest GPS signals.
4. Check the accuracy of the USB GPS receiver for your computer. Some GPS vendors employ different techniques (DGPS, WAAS) to enhance the accuracy of GPS signals and, thereby, protect the data being carried on these GPS signals (generally radio signals).
5. Check the power consumption of the GPS receiver as in whether it uses power from the netbook or uses its own power supply.
6. Check the wwarranty and support for the GPS receiver for the netbook.
7. Check the number of channels supported by the GPS receiver.
8. Check th acquisition time, both cold start and warm start.
9. Check the size of the USB GPS receiver for netbook. A heavy or large USB receiver will be uncomfortable when you are traveling.
10. Finally, you should also consider the features of the GPS software installed. It should be able to meet your requirements, providing at least two of the most basic uses of GPS: tracking and navigation. In addition, you can look for mapping and other uses of GPS.
IMPORTANT: If you are buying a used GPS receiver for your netbook, ask for the installation CD or software. If you do not have the software, you will not be able to use the USB GPS receiver for your netbook.