Factors to Affect vehicle gps tracking devices Signal
1.What is Navigation Data Format? It includes three levels: Basic data format, exchange format, storing format: Basic data format: edit and store the data. Mainly used to edit and save such as TAB format Exchange format: can be exchanged to the other format for different use. IT is public format and easier to change to the other format such as GDF format Storing format: data format storing in the computer, such as KIWI format 2. What is Map? What is the National Primary Scale Topographic Maps? Traditional map means:Mark natural and social phenomenons on the map by different Symbols and colors according to the rules of mathematics. Such as common map, thematic maps etc. Modern maps including micro map,digital map, electronic map etc 3.Factors to Affect vehicle gps tracking devices Signal (1) GPS satellites are controlled by United States Department of Defense.Chanel 1.575GHz is for the public. But the nature or human will do effect to gps signal (2) Weather factor sucsh as macula or