There are several GPS tracking watches available in the market that can help you keep track of your little ones. Here are some steps to help you set it up:

1. Choose a GPS tracker watch: Look for a GPS tracker watch that has features that you need such as real-time tracking, geofencing, and an SOS button.

2. Set up the device: Once you have chosen a GPS tracker watch, follow the manufacturer’s instructions to set it up. You may need to create an account and download an app to your smartphone.

3. Configure the geofencing: Geofencing allows you to set up a virtual boundary around a specific area. If your child leaves that area, you will receive an alert. You can set up geofencing through the app that is associated with the GPS tracker watch.

4. Test the device: Make sure the device is working properly by testing it in different locations. You should also test the geofencing and SOS buttons to ensure they work as expected.

5. Teach your child how to use it: Explain to your child the importance of wearing the GPS tracker watch and how to use the SOS button in case of an emergency.

It is important to note that while GPS tracker watches can provide peace of mind, they should not be relied upon solely to keep your child safe.

It is always important to supervise your child and make sure they are in a safe environment.