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The unit is very capable as GPS navigation. Also built in GPS functions are very useful. As a PDA this is now on the low end of the scale, as the connectivity is very limited. There is no Wi-fi or bluetooth capability built in. Also the SD card slot can't be used for Wi-fi or bluetooth SD card. Standard Palm OS 5.0 provides good overall performance. Another downside is a battery. Not only it's built-in and has to be changed by Garmin, but the capacity is quite inadequate. If you run the GPS and the screen on bright, it may only last for little over an hour. There is third party battery extender available, which uses 4 AA batteries. This is very useful for hiking or any application without external power. I also used it successfully as a secondary navigation aid for an airplane. There is additional third party software available Overall it's good as GPS with occasional use as simple PDA