A coordinate value saved in GPS memory. When there is a GPS signal, press the "MARK" key to record the current point as a road sign. It has a default name like "LMK04". Enter with up and down arrows), and you can also select an icon. The road signs are the core of GPS data, which is the basis for constituting "routes" (see 3). The marking road signs are one of the main functions of the GPS, but you can also read the coordinates of a place from the map, and enter GPS manually or through the computer interface to become a road signs. One road signs can be used in the GOTO function (see 5 targets, or you can choose a route route, see 3.) as a fulcrum. General GPS can record 500 or more road signs.

　　The route is a set of data stored in the GPS memory, including a starting point and an end point coordinate. It can also include coordinates of several intermediate points. The line segments between each two coordinate points are called "legs". Common GPS can store 20 lines, 30 "legs" per line. Each coordinate point can be selected from the existing road signs, or input value of manual/computer, and the input road points are saved as a road signs at the same time. In fact, all the points of a route are reference to a certain road bid. For example, if you change the name or coordinate of a road signs under the signs and menu, if a route is used, you will find that this line has also changed the same change. Essence There is a route that is "active". The point of the "active" route is the goal of guiding (see 5) function.

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