A typical accuracy for a hand-held GPS device would be something like 30% of your measurements within 50 meters of the true position (yes, the devices are typically that inaccurate).

Is Android GPS accurate?

For example, GPS-enabled smartphones are typically accurate to within a 4.9 m (16 ft.) radius under open sky (view source at ION.org). However, their accuracy worsens near buildings, bridges, and trees. High-end users boost GPS accuracy with dual-frequency receivers and/or augmentation systems.

How accurate is find my Android location?

It can be accurate up to 20 metres for Find My Android, and Find My iPhone has a range of accuracy settings. The apps are only as accurate as you set your GPS location services, which can still be stunted by being around tall buildings, heavily wooded areas and parking garages.