Investors have become nervous about the pending acquisitions of digital map companies Navteq (NVT) and Tele Atlas (TLATF.PK).

Navteq, which in October agreed to a $78-a-share bid from Nokia (NOK), is down sharply. Amsterdam-listed Tele Atlas, which is awaiting regulatory approval for its pending acquisition by TomTom (TMOAF.PK), has likewise taken a significant hit.

One of the most popular items on Christmas lists this year were global positioning system [GPS] devices, also known as personal navigation devices [PND]. Many stores sold out of them in early December. What these devices do, in very simple terms, is use satellites to determine your longitude and latitude, to tell you where you are and how to get where you want to go.

Although they are primarily used in boats and aircraft, their fastest growing market is automobiles. Take a look and see if any of these GPS-related stocks can guide your portfolio in the right direction.