Many people wonder which GPS to buy.
Some very basic units have a single or dual channel scanning receiver that can scan and 'lock' on 8 to 12 satellites. This article answers the questions regarding 12 channel receivers and why you might want one. This is the first question you need to ask since there are two different interpretations of the answer. One is, any receiver capable of tracking 12 satellites. The second answer is a receiver having dedicated hardware to receive 12 channels simultaneously, also known as a twelve channel parallel receiver.