Q:What is the difference between professional GPS handsets and mobile navigation?

GPS is the most important positioning accuracy. Professional handheld machine with industrial design. First of all, if used outdoors, then fell, and so on are likely to water, and this thing is also very expensive, so the opportunity to have a high professional anti shock waterproof performance.

Q:How to set the handheld GPS related parameters and coordinate conversion parameters throughout the country

Three parameter test DX, DY, DZ, DA, DF after the conversion parameters of the five, must be prompted to enter the handheld GPS, while the input area of the central meridian longitude. E on behalf of the east longitude, projection ratio of 1, the deviation of things to the north and south of the deviation of 0, and set the unit for M. Enter these parameters, should be taken to the field test, check whether these five parameters are correct. The method is selected, vision, GPS receiving signal strength of the feature points in the field (such as linear object intersections, independent features, etc.) is the best stone control points were measured and compared with theory and find out the coordinates of these points. If the results of the comparison exceed the nominal accuracy of the instrument, the conversion parameters or the problems that should be found should be recalculated.

Q:Saying that we have a project in front of it is to do so, it is surprising that there are wood

To 3D GPS it is not easy to find the map

Q:What do you need to test for GPS?

5.DGPS you know, differential GPS (DGPS) positioning accuracy is very high, some GPS equipment providers set up a DGPS transmitter in some areas, free of charge to its customers, if customers are buying GPS receivers with DGPS function. The DGPS transmitter is a fixed GPS receiver (in a 100km ~ 200km exploration scene in the radius setting) receive satellite signals, it knows exactly what is the exact time of transmitting satellite signal to the theory, and then compare it with the actual delivery time, then calculate the "difference", influence this is very close to the atmospheric refraction, it will send out the difference, usually with FM (FM) radio data transmission using subcarrier modulation signal in the baseband receiver, GPS and DGPS function can receive and use it more accurate positioning.

Q:GPS handheld function to measure it?

If the construction survey is certainly not the case, the control measurement is possible

Q:What is the difference between a hand-held GPS and a car's onboard navigator

Effect of GPS navigation handheld as vehicle, as the vehicle with what map, the hand-held GPS is mainly used for point positioning, measuring area, high precision, good anti 3, my understanding is that

Q:I am a handheld GPS precision is low, how to use to be able to improve certain accuracy

If you can join the CORS network, the accuracy of decimeter to centimeter level.

Q:I bought the way k20s, this handheld GPS how

Choi way handheld GPS feel that you can also be in the last year, the Zhengzhou Bureau of Surveying and mapping seems to be called the wide Han instrument that home to buy, so there is no problem with it, the price is not expensive.

Q:How to use the handheld GPS whole watershed investigation

Therefore, it is an important method to solve the maximum value in physics by solving the maximum and minimum values of the physical quantity by the critical state.

Q:I am ready to go to the field to go to college, but I do not know how to buy a handheld GPS, I hope you recommend. The most important thing is easy to carry.

Oh, if you go abroad to go to college, buy a map you can, no need to buy, if you want to buy, you have to look at what price, what configuration, entry-level like upstairs said, a few hundred dollars can buy one, but is relatively old models. No maps. If you want to have a map to your point, there are Yiliangqianliangsanqian. Recommended Garmin 60csx, Magellan explorer, Hua Cai Lu N400 can be.