GPS Navigation

Best waterproof marine GPS navigation systems:
 
Portable navigation system offers powerful search and traffic capabilities to drivers and increases the value of GPS to the next level. The GPSMAP 60CSx also incorporates a barometric altimeter for extremely accurate elevation data and an electronic compass that displays an accurate heading while standing still. 
Garmin GPSMAP 60CSx [...]

Best marine GPS navigation systems:
 
Users can load map data and transfer routes and waypoints through the unit’s fast USB connection. In addition, this unit features a new, highly sensitive GPS receiver that acquires satellites faster and lets users track their location in challenging conditions, such as heavy foliage or deep canyons.
Garmin GPSMAP 545s ((compare prices [...]

Best handheld marine GPS navigation systems:
 
Portable navigation system offers powerful search and traffic capabilities to drivers and increases the value of GPS to the next level.
Garmin GPSMAP 60CSx ((compare prices Garmin GPSMAP 60CSx))
Garmin Etrex Legend ((compare prices Garmin Etrex Legend))
Garmin GPSMAP 76 ((compare prices Garmin GPSMAP 76))

Best auto GPS navigation systems:
 
As more people become aware of the advantages of having Auto GPS Navigation Systems, manufacturers have started to take notice and are beginning to release a wider variety of car GPS system with many user friendly features and function. 
Tomtom ONE 3rd Edition ((compare prices Tomtom ONE 3rd Edition))
Garmin Nuvi [...]

Best motorcycle GPS navigation:
 
Since Motorcycle GPS Navigation is normally not cheap, people usually need to do market research before committing to purchasing one. Car GPS devices typically cost a few hundreds of dollars to several thousands. This will depend on the brand and features found these GPS systems. 
Garmin Zumo 550 GPS ((compare prices Garmin Zumo [...]

Best handheld Garmin Etrex navigation:
 
Handheld Garmin Etrex Navigation is sort of a dumbed-down, rugged version of the company’s more advanced eMap.
Designed specifically for hiking, biking, and camping, the eTrex is one of the easiest-to-use GPS units available. It offers the ability to track up to 12 satellites so you never lose contact with [...]

Best handheld Garmin navigation GPSMAP:

Handheld Garmin Navigation GPSMAP provides more functions than I know what to do with, incredible item! Unit tracks to +/- 9 ft with clear view of the sky and WAAS enabled! 
Garmin GPSMAP 60CSx ((compare prices Garmin GPSMAP 60CSx))
Garmin GPSMAP 76CSx ((compare prices Garmin GPSMAP 76CSx))
Garmin GPSMAP 60CX ((compare prices Garmin [...]

Best Handheld GPS navigation systems:

The Handheld GPS Navigation System is designed to provide precise GPS positioning using correction data obtained from the Wide Area Augmentation System (WAAS).
This product will provide position accuracy to less than three meters when receiving WAAS corrections. The base map contains lakes, rivers, cities, interstates, national and state highways, [...]

Best Pharos GPS navigation systems:

Once you’ve chosen the destination, the Pharos GPS Navigation Systems provides turn-by-turn directions and voice guidance on its 5-inch color touch-screen display. 
Pharos 250 GPS ((compare prices Pharos 250 GPS))
Pharos 150 GPS ((compare prices Pharos 150 GPS))

Best Cobra GPS navigation systems:

Enjoy traffic relief while commuting to work or taking a road trip with the Cobra  GPS Navigation System, the first fully integrated portable navigation system with real-time traffic updates.  
Cobra 5000 GPS ((compare prices Cobra 5000 GPS))
Cobra 2100 GPS ((compare prices Cobra 2100 GPS))
Cobra 1000dlx GPS ((compare prices Cobra 1000dlx GPS))