GPS-based container trackers use satellite signals to determine their location, so they can work without a WiFi connection as long as they have a clear view of the sky. GPS signals are transmitted from satellites orbiting the earth and are freely available to anyone with a GPS receiver.
Cellular-based container trackers, on the other hand, use cellular networks to transmit information about the location and status of a container. These trackers can work without a WiFi connection as long as there is a cellular network available. If the cellular network is not available, the tracker will store the data and transmit it when a connection is re-established.
