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While lots of devices are limited to in-car usage, a portable GPS system allows for all the mobility you may need. Non-portable devices are usually older models that require cable links, but the same inconvenience is found with combinations of PDAs or Palms and GPS devices that have to be car powered in order to save battery life. The portable GPS unit is designed according to special standards that allow for outside usage in various  applications and sports such as hiking, climbing, cycling, fishing and the like. There are some differences between a portable GPS system and the car GPS unit, and although the functions and the features may be the same, what differs is design.

It is of paramount importance to check the calculation time, the ease of programming, the speed of satellite connection, the performance and detour options. Multiple tasks are therefore suitable and available for portable GPS or hand-held GPS units. If used for outdoor applications, the portable unit should be weather resistant and waterproof in order to allow usage in all sorts of conditions without any inconvenience. The same portable device can be used in the car, since the design of new units is adaptable to a larger number of circumstances. You can for instance avoid the much dreaded traffic jams by accessing the traffic information features in the GPS device.

How can one know which is the right portable GPS system to buy? Comparisons and ratings are available for many models, and the best way to find them is on the Internet. There are in fact, web pages that provide comprehensive comparisons, reviews and price information. The good bits and bad bits of different portable GPS system models make topics of conversation in many forums, and some other people's suggestions could be really useful. It is important to stress out the fact that the navigation system should be tested for more than the vocal announcements, although this feature has a considerable significance too.

Consider the relevance of a certain feature of the portable GPS system for your personal needs. Size is also important for a portable design. If the GPS comes with a screen it may not fit your pocket, therefore, check this portability range too. Then, the price of the portable GPS system should be on your mind. If you insist on buying a low-priced unit, you could be disappointed when the unit functions only half the time. Last but not least, consider the capacity of the portable GPS system to calculate the remaining time and distance to destination, since such a function could be very useful.