Geofences & arrival detection

What a geofence does

A geofence is the property boundary doing its second job: the invisible fence Snowmass watches to decide when a machine has arrived on a property and when it has left. When a vehicle's GPS crosses into the polygon, the service visit flips to on the property; when it crosses back out having done the work, the visit can complete. This is what makes arrival times and ETAs honest rather than guesses.

Why accuracy matters

• Too tight a boundary and a machine working the far edge of a lot never registers as arrived.
• Too loose and driving past a property trips a false arrival.
• Snowmass ignores low-quality GPS fixes (it drops readings that are too imprecise) so a single bad ping doesn't fake an arrival — but a sloppy boundary it can't fix for you.

Keep detection reliable

1. Draw boundaries that match the work — generous at entrances, tight where a neighbouring property could be confused for this one.
2. Re-check tricky properties after the first storm: if arrivals looked late or missed, widen the entrance or nudge the shape.
3. Split disconnected lots into separate properties so each has its own clean geofence instead of one polygon straddling a road.

A property with no boundary has no geofence — arrival still gets inferred from proximity, but far less precisely. Drawing the boundary is the single highest-leverage thing you can do for trustworthy on-property timing.