Prevention pit father teaches you to identify five major false publicity GPS Navigator

"The GPS Navigator pass rate is less than 30%"? It was really a wake-up call to the dreamer. The result of this quality inspection undoubtedly gave us a head shot. How was the slogan that had been used to promote the product? In other words, when consumers purchase navigation products, they must not be confused by the powerful features they advertise.

At present, several common problems in GPS navigation products on the market are: slow positioning of search satellites and low accuracy; difficulty in updating pirated maps; frequent crashes due to poor performance; frequently misreported voice navigation; problems with electromagnetic compatibility, etc. The above phenomena are mostly caused by poor quality of key components and parts, and unreliable navigation software and unreasonable programming.

False propaganda 1: GPS can be positioned 100%

Knowledge point: Many factors will affect GPS reception. When comparing multiple products, you must compare them with the same place at the same time to carry out multiple cold starts in order to experience the true star collecting effect of the product.

Sometimes, in order to make GPS's reception table more reliable, it will be mixed with fake signals or simulated signals. The result data is good, positioning is not necessarily accurate, so if the business tells you that a certain product can be 100% You don't believe it.

The popularity of GPS navigators is not as wide as that of mobile phones. It will be affected by many factors. For example, we will find that the search conditions of satellites are affected in underground parking lots, under viaducts, and tunnels. In general, The range that GPS can search for signals is the area of ​​the sky that we can see. In addition, due to the different status of the sky satellites, GPS search conditions will change at any time, so GPS 100% positioning is absolutely impossible, perhaps for a consecutive day or two the signal will be affected, and sometimes its signal will be full What is more, the use of GPS is not a matter of two or more days, one or two times, to determine its performance problems, and the strength of receiving information cannot be used as the sole criterion for purchase.

False propaganda 2: GPS positioning accuracy without error

Knowledge point: GPS positioning is accurate or not. It does not mean that you can use the latest version of the map to get you to your destination with precision. All these have a lot to do with hardware and software. It is by no means the fault of GPS itself. The positioning accuracy You shouldn't imagine the "precision" word as 100%, there is a certain error can also be considered accurate. In general, the positioning accuracy of most GPS receivers is about 2.93m to 29.3m.

Inaccurate positioning is not necessarily the fault of GPS, we must know that the basic positioning error may be within 20 meters, and to achieve this standard, can be considered as a better GPS product. In addition, the accuracy of GPS positioning is affected by many factors, such as the error caused by poor signals. It may also be because the map data caused by the old navigation is not timely, it may be because the road is too wide and makes the GPS map. The display appears to be offset from the road surface, so all of these problems require the use of GPS for a long time to find out whether it is a hardware problem or a software problem.

False Propaganda 3: Perfect Specification for Data

Knowledge Point: Data is not perfect and perfect. Data can be “made”. Any product needs experience before it can be judged as good or bad.

When purchasing GPS, we often judge the adaptability and pros and cons of the product according to the specification table. However, some data in the specification table cannot be used as a hard indicator of product quality. For example, positioning within a few seconds is a few meters. Errors, sensitivities, etc. These messages seem to be "gorgeous," but these are only known after use. Therefore, looking at the data in the specifications often wastes time and time.

False propaganda 4: voice prompts for navigation

Knowledge points: The definition of voice prompts is different for navigators (especially around the island), but these are often not specified in the manual.

The first thing we need to know is that the GPS voice prompts also tend to go wrong, such as the prompts on the main road toll booths and the hints on the roundabouts of the islands. At present, there are two ways to set up a toll station. One is to block the main road and cut it off to set up a toll station; the other is to use a toll station set up after the ramp, as shown in the following high-speed toll station. It is stated that voice prompts may not be provided at the toll booths after the ramp, but voice prompts must be provided for toll booths on the main road. In addition, when the current side has a roundabout, the navigator also needs voice prompts to come out from which port, but the definition of the intersection of different navigators is not the same, and some will enter the intersection as the default 1st intersection, turn right to The 2nd and 3rd intersections, and some navigation devices will enter the intersection as the default 0th intersection, and turn right to the first, 2nd, and 3rd intersections in turn, and these default settings, most of the navigator's manual has no description.

False Propaganda 5: High Baud Rate GPS

Knowledge points: 4800, 9600 is enough, not the higher the better.

Some parameters clearly indicate that the GPS indicator can provide higher speeds, but the high speed is not very useful for basic GPS applications, and sometimes it may cause system instability. The general GPS baud rate is 4800, 9600. It is enough.

GPS new machine use notes: need to set a good bit and then add the road knowledge points: cold start positioning time of 3 to 5 minutes, hot start for 15 to 30 seconds.

If it is a newly purchased product, then GPS is best to choose fixed point in the open position, the advantage of doing so is that the speed of search positioning will be faster, but will not appear strange and now such as poor signal. If you are directly on the road (without positioning) in the cold start state, even if the GPS signal is better at the time, there is a possibility that you will not be able to locate the signal when you reach the destination. Therefore, it is recommended that consumers purchase the product and need to locate it before putting it into the car, and then observe whether the reception in the car will be very poor. It should also be reminded that the longer the single GPS usage, the longer it will take to save the satellite data. If it is not used for a long time (if not used for two weeks), it needs to be located and then used again when it is used for the first time. .