Apple

Find My

Allows you to find friends or family if you are using apple devices. Activate the Find My facility on your iPhone/iPad. Once you have shared your location your friends and family can start following your location immediately, and can share their location back to you. You can set up alerts to notify friends or family about changes in your location when you are carrying your phone.

EASE OF USE

Very Easy

Built into your iPhone, look for the 'Find My' icon

SET-UP TIME

5-10 minutes

Will depend on how many contacts you are sharing with.

PRICE

Upfront: Free

Recurring: None

Apple App Store

Other uses

Alerts and notifications.
GPS tracking.

Good to know

To get best location accuracy activate location setting on your phone.
This is not a replacement for a stand alone GPS but may be a good starting point if you are considering a GPS device.