Cartegraph One users can benefit by using external GPS receivers to gather high-accuracy locations. Esri explains it like this:
A high-accuracy GPS receiver precisely calculates geographic locations using information from GPS satellites. The accuracy of these receivers ranges from submeter to centimeter, depending on their ability to track and process satellite signals. GPS satellite signals are transmitted on different frequencies. The more frequencies that the GPS receiver uses—and, consequently, the more signals it receives—the more accurate it is. This is also true for GNSS: the more systems the receiver uses (and the more signals it receives), the more accurate it is. Today, multiple navigation satellite systems are available. However, usually, the more accurate a GPS receiver is, the more expensive it is and the more difficult it is to carry in the field.
Without an external GPS receiver, the accuracy of a tablet or phone is 3-15 feet. If you connect your tablet or phone to an external GPS receiver (usually through Bluetooth), accuracy improves to 1.5 feet to 3 feet. A third option is a paid subscription for RTK (Real Time Kinematics) corrections over cellular with sub-foot accuracy.
The two receivers we support are the Leica Zeno GG04 and Eos Arrow Lite, Arrow 100, Arrow 200, and Arrow Gold.
- The Leica or Eos app must be installed on the same device where Cartegraph One is installed.
- The external GPS receiver settings are configured using the Leica or Eos app.
- The external GPS receiver and the phone or tablet is usually connected by Bluetooth.
- When the external GPS receiver is connected to the phone or tablet and correctly configured using the vendor-specific app, all apps on the smartphone or tablet get the high-accuracy coordinates.
Leica Zeno GG04
Here are some resources to learn more: