There are two ways to transmit data from the navigation seal: GSM (cellular communication) and Iridium (satellite communication). The cost of data transmission varies significantly, so it’s important to determine the criticality of real-time data transmission in such areas. By default (without Iridium), the device stores data on location and events (including sensor readings) in non-volatile internal memory and uploads it to the server when it enters coverage zones (e.g., a port).