Abstract: A navigation apparatus (10) configured for removably coupling with and providing navigational capabilities to a portable, handheld computing device (12). The navigation apparatus (10) includes a navigation receiver (26) for receiving navigation signals from a plurality of sources; a processor (24) coupled with the navigation receiver (26) for determining a location of the navigation apparatus (10) as a function of the received navigation signals; and an interface/connector (44). The interface/connector (44) is either a Secure Digital slot connector or a Compact Flash slot connector. Location data stored in the navigation apparatus (10) and data representative of the location determined by the navigation apparatus (10) may be delivered from the processor (24) to the handheld computing device (12) so that it may be displayed and used by a user of the device (12).