Stand Alone versus Cell Phone Based GPS: Which is Right for You? - Power supply
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The difference between these two systems power is, in most cases, how you get it. Stand alone devices for your car will most likely get their power from your car via its cigarette lighter. If you are using your cell phone to get your GPS, then the power will come from the battery of your phone. It will get its power from whatever charger or dock that you normally use.
Another power-related issue that you will have to deal with is your battery. If your phone has a generally short battery life, you will wear it out quicker with the constant, active use of the phone. In addition, if you run out of battery, you will run out of both GPS and phone service.
For most responsible adults this will not be a problem, but everyone makes the mistake of forgetting one of their devices from time to time. If you are forgetful, then you may find remembering two items to be a hassle. On the flip side, however, if you forget your phone you are up the creek for both services.
When you get a stand alone GPS system, you get the sound from built-in speakers. That can give you ample sound, but if you want to have more sound options, you are going to have to go in search of an accessory pack. What you want may or may not even exist. If you use your phone you will be able to use your headset or any other system that works with your cell phone. To be honest, though, the built-in speakers will be good for most GPS users.
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