The correct way to use a GPS receiver in the field

　　1. You should conduct sufficient research on the area to be entered in advance. Now, the network is so developed that it is possible to study the target area using the electronic vector maps and satellite photos that are already available. The former recommends "Electronic Map of China" (the most accurate national vector map I have ever seen!), and the latter is of course "Google Earth". Again, it feels good to see the world as God from the sky. What are we researching on the map? The first is to mark the coordinates of POIs (points of interest) around the target area, such as the nearest settlements, gas stations, towns, villages, and even the turning points and intersections of roads around uninhabited areas such as a desert or forest. The second is to browse the target area through satellite maps and look for signs with distinctive features. For example, a hill in the desert, a small lake in the Gobi, or a clearing in a forest. Of course, the more the better, the more evenly distributed the better. Because once there is a problem, you can choose the nearest point to go to.

　　2. Data preparation. All of these POIs are marked on screenshots of different scales, printed out (preferably both satellite photos and vector maps), and bound into a booklet. At the same time, an index page should be established to list the names and descriptions of all POIs. The next thing to do is to input these POIs into the GPS according to the defined names and save them as waypoints. I suggest that the waypoint names do not start with numbers as much as possible to prevent confusion with temporary waypoints.

　　3. Power preparation. All electronic devices require electrical energy. If you don't have a solar panel charger or a power generator like a hand generator, it's best to prepare a few AA or AAA batteries in advance, which is also the most economical way. This is why I always recommend choosing a GPS receiver with AA or AAA batteries. Because this kind of battery can be bought in any commissary in any small place. Even in an unoccupied area, taking 20 batteries with you will allow the GPS receiver to work even after you have eaten all the food, based on 10-14 hours of continuous use per pair of batteries. Those devices that use rechargeable batteries are quite troublesome at this time. Although the capacity is large, after more than 10 hours, charging will be a big problem. Without electricity, it can sometimes be life-threatening.

　　4. Don't forget the traditional map. Many people think that with GPS, traditional maps can be discarded. This is absolutely not the case. First, the current GPS built-in maps are rather crude and incompatible. And they're mostly urban. Remember, getting lost in the city doesn't kill you. GPS electronic maps, especially in the wild without roads, are even more "white". In addition, it is almost impossible to find GPS-specific electronic detailed maps specific to a certain area (such as a 200-kilometer radius around the Hoh Xil protection station). Therefore, traditional paper maps, especially large-scale, contour area maps with latitude and longitude are very important. Finally, don't forget to bring a triangular board with a protractor, a pencil or a compass by the way. (the usage will be explained later)

　　5. Finally on the road, on the road, you travel alone, full of longing for the destination, and enjoy the beautiful desert scenery along the road. At this time, don't forget to define a waypoint on the GPS receiver every time you pass a marker point - this is a temporary waypoint. They could be an abandoned house, a lone tree in the desert, or all the inflection points that cross the road. These waypoints are numerically named and stored in order. Don't forget to take out your notebook (not a computer), and write down the relevant names and descriptions with notes, such as: Waypoint 005: A bridge over a small river about 15 minutes north of Luanshi Mountain. That way, when you're looking for a return trip, it's fairly simple.

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