Low GPS/GLONASS Accuracy
Coordinate accuracy depends ONLY on your smartphone or tablet's receiver. If accuracy is low, you should switch to a different device. This is a hardware limitation of the phone, and the app cannot overcome it.
What you can do
- Move the phone or tablet holder as close to the windshield as possible so that the roof blocks as little satellite visibility as possible.
- Keep it away from the metal dashboard or other magnetic materials.
- Try another device — even an iPhone 7 shows excellent accuracy.
- Use an external DIY receiver (10–20 cm accuracy).
Learn more about the DIY receiver →
Track Recorded at an Angle
Some devices output compass readings with a shifted angle relative to true north when used in a vertical position. There are three main causes:
Cause 1: Magnetic Declination
The device may not account for magnetic declination correction and shows readings relative to magnetic north (while GLONASS draws the track based on geographic north). In this case, simply toggle the heading correction switch in the app settings.
Cause 2: Compass Only Calibrated in Horizontal Position
The device works correctly only in a horizontal position (on the palm), and in the vertical orientation, as it is typically mounted in the cab, the north reading drifts. To make the track display correctly, it is sometimes enough to slightly rotate the device left and right in the holder, or use manual compass correction in the app settings. Of course, during operation the tablet holder must be rigidly fixed relative to the tractor, otherwise the heading will constantly drift.
Cause 3: No Built-in Compass
In this case, you can disable the compass in the app, and the heading obtained from the GLONASS/GPS receiver will be used instead.
How to Improve Accuracy
If your phone does not have a very good GPS module or the tractor cab strongly shields the satellite signal, you can connect an external GLONASS/GPS satellite receiver to improve accuracy. You can build a receiver for a parallel driving system yourself using our instructions, or order a ready-made device from us.
For pre-orders and questions, email: sale@free-gps.ru