How can I see if my environment has a good magnetic field?

You can check by downloading Physics Toolbox Magnetometer.You need be aware of the strength of your magnetic field in uTand walking around your game space. You may want to check at different heights like chest level, waist level and ankle level. You just need to pay full attention, do not pay attention to the X, Y or Z components.Most phones have a magnetometer, but if yours doesn't, there's no way to be sure exactly what your magnetic environment is. There is currently limited data to provide an exact range,but a good baseline seems to be a range less than or equal to 5 uT. For example, 20-25 uT would be fine, as would 40-45 uT, but a range of 20-40 uT would probably be too unstable to use.

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Recommendations to decrease drift and ping!

A good WiFi modem.

a good magnetic field

Wi-Fi modem close to your PC and your trackers.

use theTicks that appear in the app, each tick is 10 ms. 

Intensity of 60% -  30%

A good calibration: Leave your tracker on a flat surface after turning it on for 2-3 minutes.

Remove transmitters and magnets in your play area