Visit: http://techzend.com/gps-tracking-devices-for-cars-reviews
Here are very best GPS tracking devices that are portable and can track and monitor your vehicles including car, bus, truck and motorcycle. Moreover, it can track humans and animals too because they are smaller than a piece of cake and can be fitted in your hand.

Read more here: http://en.wikipedia.org/wiki/Global_Positioning_System

Device 1: Sourcingbay®: http://tinyurl.com/p3n3ddm $38

Device 2: AFUNTA: http://tinyurl.com/omr33nw $44

Device: 3: Spy Tec STI_GL300 Mini Portable Real Time GPS Tracker: http://tinyurl.com/pqtc3qd $135

Device 4: MasTrack OBD: http://tinyurl.com/pen2yhk $91

Source: https://www.youtube.com/watch?v=XhUCgbbOSnQ