Setting Up Perimeter Guard: Stay Within Your Permitted Zone

When a landowner gives you permission to detect on a specific field, you need to stay in that field. Walk too far and you're on someone else's land without permission. Perimeter Guard solves this by drawing a virtual fence on the map and buzzing your phone as you approach the edge.

Drawing a Boundary

Open the map and tap the Perimeter Guard icon. The map switches to boundary drawing mode:

• Tap on the map to place corner points around your permitted area
• Each tap adds a point and connects it to the previous one
• Use the undo button if you misplace a point
• When you're done, tap the checkmark — the shape closes automatically

Zoom in on satellite view first so you can follow field boundaries, hedgerows, and fences accurately.

How the Alerts Work

Once you activate Perimeter Guard, it watches your GPS position and steps you through four stages as you approach the boundary:

• Approaching boundary — you're heading toward the edge but still safely inside
• Near boundary — you're close, a vibration nudge tells you to ease up
• At boundary edge — you're right on the line, stronger haptic warning
• Outside perimeter — you've crossed it, audio alarm with continuous vibration

You don't need to stare at the screen. The haptic and audio pattern tells you everything. Just swing your detector and let your phone do the watching.

Linking to the Permission Vault

If you've already saved a permission entry in the Permission Vault for this site, you can link the boundary to it. This means the boundary is stored alongside your permission details — next time you visit the same site, load the permission and the boundary comes with it.

Clearing or Editing Boundaries

Tap the Perimeter Guard icon again while a boundary is active to see your options. You can clear the current boundary and draw a new one, or deactivate monitoring temporarily without deleting the shape. If your permission area changes, just redraw it.