What is aGPS?
aGPS is Assisted Global Positioning System. It was introduced to enhance performance. With conventional GPS systems, it is often difficult to provide reliable positions under poor signal conditions, for example, if you are surrounded by tall buildings (as a result of multipath) or if the satellite signals are weakened when you are indoors or under a tree. Some newer receivers fare better. The aGPS system, consisting of an integrated GPS receiver and network components, boosts performance beyond that of the same receiver in a stand-alone mode.

when we buy GPS, we should consider GPS power supply and GPS battery capabilities. since many of time, we use GPS in the car or outdoors, and sometimes in long distance travel navigation. GPS devices designed primarily for in-car use plug into the car’s 12-volt power port. there are car chargers for car gps and bluetooth gps. but for hiking, there are different battery design for the various products. for example: some GPS use the samebatteries as Nokia cellphone, so the Nokia mobile phone users can use cell phone battery …

How to clean GPS touch screens for Garmin nuvi,tomtom,lowrance,etc. the GPS touch screens are sensitive, so we should pay attention to clean the gps screen. there are some ways to clean it: the special wipes for electronics or LCD computer monitors would work. You could also just go with a slightly damp cloth that will not scratch the screen. Many users recommend using 50% water and 50% isopropyl alcohol for cleaning LCD screens.
A damp micro fiber cloth or an eye glass cleaning cloth would be good for cleaning the GPS …

GPS antenna can enhance GPS to receive satellite signal and increase the scope at the same time. For example, if you can not get the signal in the house. you can signal through the GPS antenna outside the house.
genereally, the sirf III GPS chip can receive signal without GPS antenna. However, there are some exceptional circumstances, such as bad weather conditions, buildings block. you can purchase GPS antenna as an back up. GPS antenna can also improve the signal strength.

what is Differential GPS (DGPS)? Differential GPS, or DGPS, has been developed to improve GPS accuracy to within a few meters. DGPS was originally initiated by the U.S. Coast Guard to counter the accuracy degradation caused by Selective Availability. Even with S/A now eliminated, DGPS continues to be a key tool for highly precise navigation on land and sea. DGPS technology adds a land-based reference receiver – located at an accurately surveyed site – to the other GPS components. This non-moving DGPS reference station knows where the satellites are located …

how to install gps utility: you can copy the GPS utility file to the computer to be used for downloading. This is a self-extracting zip file. Double-click on this file to unzip it. You will be prompted to save the contents; you should save it to a new folder (create it simply by typing the new name in the window).
then go to this directory and then double click on Setup.exe. (There are a number of other setup files, make sure the one you click on is Setup.exe.) This will start …