GPS Guinness entry terms
GPS positioning of the field as the best tool in the outdoor sports have a wide range of applications, at home can see more and more often it was used. GPS does not like television or radio, will be able to use to open it more like a camera, you need to have a certain knowledge.

First we need to clarify the use of GPS often encountered some of the terminology:

1. Coordinate (coordinate)

There are 2-D and 3-dimensional coordinates of the two said that when the GPS and be able to receive more than 4 satellite signal, it can calculate the local micro-3 coordinates: longitude, latitude, altitude, if only received 3 satellite Signal, it can only calculate the 2-dimensional coordinates: latitude and accuracy, this time it may also show a high degree of data, but data is invalid. Most of the GPS not only can be made in / latitude (Lat / Long) way to show the coordinates, but also with UTM (Universal Transverse Mercator) coordinate system, such as display coordinates, but we generally use or LAT / LONG system, which is up to you The use of the map coordinates of the system's decision. In the coordinates precision of the Selective Availability (U.S. Department of Defense to reduce the accuracy of GPS and the implementation of a measure) when it opened, GPS accuracy in the level of 100-50 meters, depending on how many receive the satellite signals and the strength of the If the GPS instructions that you have arrived, then take a look around, it should be about the size of a football field found in the area of your goals.

In SA closed, the accuracy can reach 15 meters. A high degree of accuracy of the system due to structural reasons, was not so satisfactory. Latitude and longitude appear as a general rule according to their choice of love, there is a general \ "hddd.ddddd \", \ "hddd * mm.mmm \" \ ", \" hddd * mm \ "ss.s \" \ "\ "(The" * "stands for" degrees ", with the following) the Earth's meridian is 39940.67 km long, the latitude to change once combined 110.94 km, a division 1.849 km, the second combined 30.8 meters, the equatorial ring is 40075.36 km, Wei in Beijing At 40 degrees north latitude, latitude circle for a long 40075 * sin (90-40), here together at one time longitude 276 km, 1.42 km division of a combined 23.69 meters a second, you can select a display, and you A change in the number corresponding to the number of mobile ground-meter remember that this kind of latitude and longitude can be established and the actual mileage is probably a response. Most of the GPS has calculated the distance between two feature two given the exact distance between coordinates. Show that there is a high degree of both metric and imperial, GPS into the SETUP page, set the metric system, such as in the other speed, distance, and so the show will also become the metric system.

2. Signs (Landmark or Waypoint)

GPS to preserve the memory of the coordinates of a point. Where GPS signals, click \ "MARK \" button, the current point will be credited into a signpost, there is a general default, as is \ "LMK04 \" like the name, you can modify into a recognizable The name (with the letters up and down arrow input), you can select an icon to it. GPS data is the core of the roadmap, which is a "line" (see 3). Road signs marking is one of the main functions of GPS, but you can also read out a map of the location coordinates by hand or computer input interface GPS, as a signpost. Can be a signpost for the future GOTO function (see 5) the target can be elected to a line of Route, see 3.) As a fulcrum. General GPS to record 500 or more signs.

3. Line (ROUTE)

GPS is a line of memory stored in a set of data, including a starting point and a destination coordinates, but also including a number of points among the coordinates of each point between the two coordinates of a segment called \ "legs \" (leg). GPS common to store 20 lines, each line 30 \ "legs \." The coordinates of the points can select from the existing road signs, or hand / computer numerical input, the input of the road at the same time as a signpost (Waypoint / Landmark) to preserve. In fact a line all the signs point to a reference, such as road signs in your menu under the signs of a change in name or coordinates, if a certain line to use it, you will find this route have also taken place in the same change . There may be a line \ "dynamic \" (Activity)'s. "Active" is the way the line-oriented (see 5) function.

4. The way forward (Heading)

GPS compass does not function, when it is standing still do not know the direction. But once moved, it will be able to know the direction of movement. GPS is updated every second of the current location information, and the coordinates of each point on the coordinates of a point of comparison, will be able to know the way forward, please note that this is not the first GPS refers to the direction that it is elderly people do not know their own minds and Movement into line is the number of degrees. GPS on the way forward for different algorithms are different, is the latest of a number of seconds the way forward, so unless you have gone for a walk in a straight line and still, or the way forward is not accurate, especially in a time when you turn To see change in the value of non-stop. The direction of the show is based on the number of degrees, and alcohol is watch dial up, 12:00 point to the north, clockwise to the point of view. There are a lot of GPS also can point to the ruler and compass to show the way in this light. At the same time, the general also showed that the average speed of progress, but also in the light of recent displacement of a period of time and calculated.

5. Oriented (Bearing)

Feature-oriented work in the following conditions:

1.) Set to \ "to \" (GOTO) goal. \ "To \" the goal can be set according to the \ "GOTO \" button, then select from a list of signs. After the \ "oriented \" function-oriented to the road signs.

2.) Are currently active line (Activity route). Active line in the General Settings -> line set up under the menu. If there are activities of the line, then \ "oriented \" is the first line of the road, a way to reach every point, refers to the automatic path to the next point.

In the \ "oriented \" top of the page will be marked with the name of the current point-oriented way (\ "ROUTE \" The point is, there's the name). It is based on the current location, calculated on the goal-oriented in the direction of your angle, with \ "the way forward \" the same point of view of the value of the show. At the same time show the distance from the goal, and other information. Read-oriented direction, the direction may come to this destination. Some of the GPS-oriented features and the way forward together, as long as the use of GPS in the first point to the way forward, there will be a pointer arrow pointing the way forward for the goal and direction of declination, along with the arrow will be able to find the target.

6. Sunset time (Sun set / raise time)

GPS can show that the majority of local sunrise and sunset times, which plans to start / time when the camp is useful. This is according to the local GPS longitude and date to be calculated, is the plain areas of sunrise, sunset, the mountain ridge because of the shelter, under the bright sunshine duration of the situation sooner or later to the less than half an hour. The GPS satellite signal is received from the Greenwich system, set up in the (setup) menu, you can set the local time offset for China, should be +8 hours, the value of time and only show that.

7. Footprints Line (Plot trail)

GPS coordinates are updated once per second, it can record their own trajectory. General GPS to record tracks for more than 1024 points in a special page to show that adjustable-scale mobile trajectory. Footprint of the sampling points are automatic and automatic sampling in two ways from time to time by the GPS automatic point sampling footsteps decided to approach the general direction of the record is the only turning point in long-distance walking in a straight line when they do not mind that point; regular sampling can be provided for sampling interval, such as 30 seconds , 1 minute, 5 minutes or any other time, at a footprint in mind for such a long time point. In the line of footprints on the page can clearly see the footprints of their own level of projection. You can record start and stop record, set or clear line of footprints. "Footprint" of the online point did not name, can not be used alone to check their coordinates, is mainly used to draw the road map (to download the computer line?) And the "back" function. There is a lot of GPS called the "back" (Trace back) function, use this feature, it will be translated into a line of footprints, "route" (ROUTE), point the way by the choice of GPS to complete the internal procedures are generally selected tracks Online big turning point.

At the same time, to activate the line for the activities of the line, the user can be guided by the same route to return to function. It should be noted that the general will function back into the back line of a default route (for example route0), you see the GPS statement, the use of the line before checking the availability of data, if so, use the first copy function to copy Went to another line in the air, so as not to cover. Back from various points on the line with the provisional name of the default system, such as \ "T001 \" and the like, and some GPS will be the second line, back when they reuse the name, this time even if you have the old line did a copy, as Point Road, cited by the name of reuse, so will change the routes, rather than that of the original back of the line. Please check your manual to use the GPS, and you try to clear. Necessary, the need for long-term preservation of TraceBack line, it is necessary to free copies of the road, and rename the names of all the points the way.