1. Introduction
Some mobile phones have built in global navigation satellite system (GNSS) for finding your position and magnetometer (Compass) for finding your orientation.
Compass
Mobile phone built-in magetometer can be used as a compass.
1. Tips
- Move away from metal
- Make "figure 8s" in the air with your phone
2. 88.io Compass
88.io Web Console comes with a web based compass.
https://measure.contacttrace.com.au/
3. In Depth
https://www.ngdc.noaa.gov/geomag/calculators/magcalc.shtml#declination
https://www.ngdc.noaa.gov/geomag/calculators/mobileDeclination.shtml
GNSS
Mobile phone built-in GNSS capability is a major contributor to geopos.org's location feature. We are pushing it to its limits to get higher accuracy in shorter time.
Need at least 4 satellites to give you latitude, longitude, altitude and time.
- Get unobstructed view of sky
- Get as many satellites a possible
Dual Frequency
For high precision get a phone with Dual Frequency GNSS support (e.g. high end Samsung and Huawei phones).
Centimetre Accuracy
In order to get accuracy down to centimetre level, Real Time Kinematic (RTK) or Post Processing Kinematic (PPK) can be used with your mobile phone.
We encourages citizens to build up their own RTK infrastructure in the communities.