GPS Horizontal Positioning Error

The estimated accuracy of the position in metres.

EXIF tag ID: 0x001F
Group: Location (GPS)
Example: 4.7 m · 65 m (indoors, Wi-Fi positioning)
Editable in EXIF Viewer: Yes

What iPhone writes

Written since iOS 8; tells you how much to trust the pin.

What dedicated cameras write

Rare.

How to view GPS Horizontal Positioning Error on iPhone

Open the photo in Photos, tap Share, then View EXIF (EXIF Viewer’s action extension). The field is listed under “Location (GPS)”. Tap Edit to change it, or select several photos in the app to change them all at once. Or drop the photo into the free online EXIF viewer.

Related tags

GPS Latitude — North–south position where the photo was taken, stored as degrees, minutes, seconds plus a N/S reference.