By
eHow Electronics Editor
Difficulty: Moderately Easy
Things You’ll Need:
Step1
Compare the map display and map functions. GPS navigation maps vary in detail. Some maps include details like elevation and street detail. Don’t overdo it and buy a GPS navigation device with map details you will rarely use.
Step2
Decide what type of display you want, horizontal or vertical. Consider the number of pixels on your GPS system's screen -- that is, the degree of resolution. Screens are available in a variety of sizes. Choose the specifications that best fit your needs.
Step3
Consider antennae voltage and battery life. Choose a model with a high antennae voltage for clearer reception. People who take long trips should consider buying a GPS navigation model with a long battery life.