The iPod touch, the iPad (Wi-Fi only models), and the original iPhone do not include a GPS receiver. To use these devices for navigation, you need to connect them to a GPS accessory device.
Note: Using a GPS accessory device can also improve the accuracy of GPS in other iOS models.
When you first start the TomTom app, it may need a few minutes to find your GPS position and show your current location on the map.
To make sure you have good GPS reception, you should use your device outdoors. Large objects such as tall buildings can sometimes interfere with reception.
Important: The TomTom app cannot give you route instructions until it has received location data. Make sure Location Services are switched on.
If your device has no GPS reception, the TomTom app uses positioning information from WiFi networks or mobile phone towers. This information is used for route planning and to determine your approximate location.