For travellers planning to visit Iceland, we highly recommend the official app for Iceland’s emergency service, 112.
This app has two major functions
One: “Check in” button to send your current location, but 112 emergency service will log you last 10 locations.
Two: “Emergency” button to send your location via SMS to 112, with the phones GPS location, before calling 112.
The app can be downloaded here
Here in Icelandic