The iSPHERE is a unique buoy designed for oil spill tracking. Offered as an alternative to the standard ARGOSPHERE drifter, this new-generation buoy uses the bi-directional Iridium® satellite system to communicate and to transmit essential scientific data. Iridium® telemetry is the most cost-effective means of transmitting data for environmental applications. The Iridium® modem provides the end-user with lower transmission costs and an increase in data throughput. The two-way communication allows for customized data.