# US 11,443,608 B2 · Wearable devices > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,443,608 B2 - Document ID: US11443608B2 - Status: Granted - Kind: B2 - Application number: 16/628,257 - Filed: 2018-07-03 - Published: 2022-04-14 - Granted: 2022-09-13 - Earliest claimed: 2017-07-05 - Applicants: Wearable Link Limited - Inventors: Thomas James Williams - Web page: https://patentgrep.com/patent/US11443608B2 ## CPC - G08B 21/0269: {System arrangements wherein the object is to detect the exact location of child or item using a navigation satellite system, e.g. GPS} - G08B 21/0261: {System arrangements wherein the object is to detect trespassing over a fixed physical boundary, e.g. the end of a garden} - G08B 21/22: responsive to presence or absence of persons - H04W 4/022: {with dynamic range variability} - G08B 17/00: Fire alarms; Alarms responsive to explosion - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract A geofencing system (100) comprises at least one physical, moveable marker (102), the or each marker being arranged to define at least part of a geofence (106) based on the position of the moveable marker (102) such that changing the position of the or each moveable marker (102) changes the geofence (106). The or each marker (102) is arranged to provide a visible and/or audible indication of geofence (106). The system (100) also comprises at least one wearable device (104) arranged to receive data concerning the position of the geofence (106). The wearable device (104) is arranged to store up-to-date geofence information and to provide an alert in response to the wearable device (104) crossing the geofence (106). ## Claims ### Claim 1 A geofencing system comprising: at least one physical, moveable marker, the or each marker being arranged to define at least part of a geofence based on the position of the moveable marker such that changing the position of the or each moveable marker changes the geofence, and wherein the or each marker is arranged to be human-portable by an individual for allowing the person to pick up and carry the marker and provide a visible and/or audible indication of the geofence, and the or each marker is arranged to indicate the presence of the geofence and the shape of the geofence; and at least one wearable device arranged to receive data concerning the position of the geofence, and wherein the wearable device is arranged to store geofence information and to provide an alert in response to the wearable device crossing the geofence. ### Claim 2 (depends on 1) The system of claim 1 wherein the or each marker indicates a direction in which the geofence extends therefrom, optionally with a clearly visible arrow. ### Claim 3 (depends on 1) The system of claim 1 wherein the system comprises a plurality of markers, and wherein the markers define corners of a polygonal geofence. ### Claim 4 (depends on 1) The system of claim 1 wherein the or each wearable device is arranged to listen at set times to receive updates to the geofence information resulting from movement of one or more of the markers. ### Claim 5 (depends on 1) The system of claim 1 wherein the at least one wearable device is arranged to provide data on a position of the wearable device to the marker and the marker is arranged to log position data of the at least one wearable device. ### Claim 6 (depends on 1) The system of claim 1 wherein the or each marker is powered by an internal battery. ### Claim 7 (depends on 1) The system of claim 1 wherein the or each marker has sensing capabilities, including a capability to detect one or more of wind, certain gases, pressure, and temperature. ### Claim 8 (depends on 7) The system of claim 7 wherein the or each marker is arranged to create or change the geofence based on sensed conditions. ### Claim 9 (depends on 1) The system of claim 1 wherein the or each device has an emergency mode and is arranged to transmit a signal in response to activation of the emergency mode. ### Claim 10 (depends on 7) The system of claim 7 wherein the or each marker is arranged to transmit an alert to the at least one wearable device based on sensed conditions. ### Claim 11 (depends on 1) The system of claim 1 wherein the or each marker is arranged to broadcast a message to at least one of the wearable devices if one of the wearable devices crosses the geofence. ### Claim 12 (depends on 11) The system of claim 11 wherein a GNSS timestamp is used to time broadcasting of the message. ### Claim 13 A geofencing system comprising: at least one physical, moveable marker, the or each marker being arranged to define at least part of a geofence based on the position of the moveable marker such that changing the position of the or each moveable marker changes the geofence, and wherein the or each marker is arranged to be human-portable by an individual for allowing the person to pick up and carry the marker and provide a visible and/or audible indication of the geofence, and the or each marker is arranged to indicate the presence of the geofence and the shape of the geofence; and at least one wearable device arranged to receive data concerning the position of the geofence, and wherein the wearable device is arranged to store geofence information and to provide an alert in response to the wearable device crossing the geofence; wherein the or each marker indicates a direction in which the geofence extends therefrom; wherein the system comprises a plurality of markers, and wherein the markers define corners of a polygonal geofence; wherein the or each wearable device is arranged to listen at set times to receive updates to the geofence information resulting from movement of one or more of the markers; wherein the at least one wearable device is arranged to provide data on a position of the wearable device to the marker and the marker is arranged to log position data of the at least one wearable device. ### Claim 14 (depends on 13) A geofencing system as claimed in claim 13 wherein the or each marker is powered by an internal battery.