1. Time interval refers to the recording of position points every other time period. Commonly used time intervals include 1 second, 5 seconds, 10 seconds, 15 seconds, 30 seconds, 60 seconds, and 120 seconds.

　　2. Distance interval refers to the recording of position points every time a distance is moved. The commonly used distance intervals are 50 meters, 100 meters, 150 meters, 300 meters, 500 meters, and 1000 meters.

　　GPS trajectories are mainly used to record and replay trajectories, and software or websites that can complete these functions can view:

　　1. Google Earth can open trajectory files in GPX or KML format and display them on Earth. The disadvantage is that there is no centralized storage and sharing method, and it does not support the important outdoor activity information of time.

　　2. The six legged websites in China can support uploading and sharing of dozens of trajectory file formats, and focus on supporting trajectory time information. The disadvantage is that the online time is not too long, and many functions are still being improved.

　　3. Foreign WikiLoc websites can also perform functions similar to six legged websites, with better search performance compared to six legged websites. The disadvantage is that foreign websites are slow and mainly used by European and American countries, which differs greatly from the usage habits of Chinese people.

　　The GPS trajectory, coupled with the communication part, can be transmitted in real-time to the network for relevant users to share in the first time. In this regard, smartphones with GPS chips will be the main carrier. The mobile software provided by the Six Legs website can record, upload, and share trajectories in multiple ways in real-time.

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