Location, geofences and their limits

GPS trackers and wandering alerts

A practical guide to GPS watches, alarms and trackers for someone at risk of becoming lost, including battery, indoor accuracy and consent.

The working principle

Start with the practical problem, choose the least complex reliable option and decide who acts when something goes wrong.

What location technology can do

A GPS device can show an approximate outdoor location, trigger an alert when a defined area is left and allow the wearer to call for help. Some monitored alarms combine these functions with two-way speech and fall detection.

The system only works when the device is carried, charged, connected and associated with somebody able to respond.

Common device formats

  • Watch: visible, wearable and often rechargeable daily.
  • Pendant alarm: simple and may include two-way speech.
  • Small tracker: easy to place in clothing or a bag, but also easy to leave behind.
  • Phone-based sharing: inexpensive when the person reliably carries and charges a phone.

Accuracy and coverage

GPS is generally strongest outdoors with a clear view of the sky. Indoor location can be slower or less precise. Mobile coverage, building construction and battery-saving modes also affect performance.

A map pin should be treated as evidence to guide a response, not divine revelation to the nearest chair.

Consent, capacity and dignity

Location tracking is intrusive. Agree when it is used, who sees the data and what action is taken. Where the person may lack capacity to consent, seek appropriate professional guidance and document why the arrangement is necessary and proportionate.

When professional advice matters

Seek appropriate medical, pharmacy, occupational-therapy, social-care or safeguarding advice where the decision affects medication, emergency response, capacity, consent, mobility or significant risk. A website cannot observe the home, the person or the family’s ability to respond.

Relevant directory entries

Systems mentioned by this topic

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Available in the UK Evidence B

GPS and personal alarms

Taking Care Anywhere

by Taking Care

A GPS personal alarm intended for use at home and while out.

Access
Available to UK consumers
Cost
Setup plus monthly fee
Camera
No

Main limitation: GPS can be less accurate indoors and the unit must remain charged and carried.

View the reality check
Available in the UK Evidence B

GPS and personal alarms

Tunstall Ally Watch

by Tunstall Healthcare

A connected watch combining an alarm button, fall detection, location and geofencing.

Access
Available through Tunstall services and partners
Cost
Quote required
Camera
No

Main limitation: It is still a wearable that must be charged and accepted by the user.

View the reality check
Available in the UK Evidence B

Fall detection

Taking Care Digital Fall Alarm

by Taking Care

A home-and-garden alarm with automatic fall detection and 24-hour monitoring.

Access
Available to UK consumers
Cost
Setup plus monthly fee
Camera
No

Main limitation: No fall detector catches every event, and the wearable still has to be worn.

View the reality check