Pricing GPS receivers requires that you know about how GPS works and have an understanding of how the functions work. This allows you to determine the real value of the GPS device and how it will benefit you.
Talking GPS receivers, as an example, make use of speech adaptation programs to allow you to speak and be spoken to by the device.
This is a very difficult feature to add to a homemade GPS receiver, which should affect the price you purchase the device for. Homemade GPS receivers, while a cheaper alternative than purchasing them from the store, require a great deal of research and time in order to implement correctly. On account of this, it is usually suggested that you purchase a lower end GPS unit from the store rather than try to make one yourself.
There are several aspects you should consider when pricing GPS receivers.
First, you need to consider the number of features and the brand. This combination is the primary aspect, and will greatly affect the overall pricing of the GPS unit. On account of this, you will want to take care and compare the differences per feature by brand.
Garmin and Magellan GPS units tend to have a higher cost per feature, but are more reliable. This is where the second aspect comes into effect: reliability. The combination of these three primary will make up the final cost. Only after you have compared a variety of different products should you make a final purchase.