Our tracking software uses the Federal Government's Geocoded National Address file (GNAF) as a data source. In most instances the GPS point for each property is set in the middle of the property or nearer the street frontage. We geofence these properties, and when a walker walks within 2m of the property it lets us know by checking off the blue dot. When the GPS point for that property is set back further into the lot, the geofence is set back further and so the blue dot isn't checked.
This can include instances where:
- The property is set back well from the street (like a battle-axe property arrangement) and are likely to have a letterbox on the street
- There is a GPS point for a park, or beach
- The geocode for that property is not set to the middle of the property, but at the far end
In all the above cases, these blue dots are either not delivery points or the letterbox was on the street.