Map Direction Compass DC455

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Payment Terms:: TT OR LC

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Product details

Model: DC455

Name: Professional map compass, ruler compass

Product Origin: China

Supply Ability: 10,000 pcs/month

Minimum Order: 30 pcs

MOQ for OEM package: 500pcs

Material: Plastic

Features

1, professional usage: orientation, distance measuring, measuring slope, azimuth and pitching Angle measurement, drawing, a magnifying glass

2, high quality compass with neck rope, portable and rugged
3, ACRYLIC material, about 2mm thick
4, Damping Dial: to keep the stability of the pointer, more suitable for outdoor

environment.
5, Accuracy: accurate and clear, there were 360 degrees azimuth Angle, outer ring is 64-00 system, Liquid filled in the compass for reliable readings.

6, Magnifier function

Q: Is it accurate to measure highway mileage with GPS handheld: Measuring mileage, since the unit has been upgraded to the inside, it is quite accurate oh

Q: How to set the handheld GPS related parameters and coordinate conversion parameters throughout the country: Two. To coordinate the coordinate data of the control points obtained provide technical support unit of Beijing Unistrong companies around the branch responsible person to calculate the coordinate transformation parameters conversion parameters, or to obtain their own conversion conversion software. After the conversion parameters are calculated by the prompt input handheld GPS. Only after such a setup, after all the soil in the region when the coordinates of the GPS read out the coordinates of the point for the Beijing 54 coordinates.

Q: What is the difference between industrial GPS handset and mobile navigation: I am a professional to do GPS, the difference between the professional handheld and mobile GPS is very understanding, here and your simple communication.1, GPS is the most important positioning accuracy and confidence. Professional handheld GPS chip used to stabilize the performance of some, the accuracy will be better, such as Garmin handheld high-end product positioning can be achieved within 3 meters, while the phone's GPS chip is different.2, both in the design and positioning of the crowd is very different. Professional GPS more focus on outdoor industry and users, the use of design idea is how to better outdoors, outdoor tourism including tourism exploration assistant very full function, and mobile phone GPS is a trend not only, what purpose.

Q: Hand held GPS coordinate conversion method: 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: GPS handheld function to measure it?: Depends on the accuracy of the range you require, if the accuracy of the 3-5 meter can be used for ranging, measuring area, latitude and longitude, elevation information, etc.

Q: Handheld GPS and mobile phone GPS what is the difference?: Different: antenna size, function, accuracy, protection level, and has been different in the application layer (handheld GPS support GPS compass navigation and map navigation and other more professional GPS applications);

Q: What do you need to test for GPS?: 3 positioning time this means when you restart your GPS receiver, it determines the time required for the current position. For the 12 channel receiver, if you are in the last position near the location of the cold start time is 30 seconds to 5 minutes, hot start is usually 5 to 40 seconds, and for the 2 channel receiver, most of the cold start more than 15 minutes, hot start 2 to 5 minutes. The positioning accuracy of the positioning accuracy of 4 which is obtained in the case of no WAAS/EGNOS conclusion, rather than most of the GPS receiver specification of the positioning accuracy, can look at the test report of others so before the purchase of GPS, now on the market with 12 channel GPS receiver error level is generally not more than 30 meters, height error not more than 50 meters, the average error is about 15 meters. Due to the use of the module, our product positioning error is about 10 meters,

Q: Saying that we have a project in front of it is to do so, it is surprising that there are wood: It is really unexpected, basically not, the accuracy is not enough!

Q: Handheld GPS, the measurement of arable land, fixed point and circle test, which is more accurate,: If the area is measured, are almost. However, if the measurement point is only the case, the dynamic GPS is now the general error can be guaranteed within 3cm, the total station can be guaranteed to the millimeter.