Designed in the late 24th century by Starfleet science officer Jamal Mahtani and sensor technology expert Doctor Nathan Bridger, the Sensor Probe Reconnaissance Array ('SPRA) is a prototype sensor system which allows the host vessel greater sensor coverage of a given area. Dr Bridger's ancestor, Captain Nathan Bridger, designed the submersible SeaQuest and the Wireless Sea Knowledge Retrieval Satellites (Whiskers) in early twenty-first century. The SPRA network is based upon the Whiskers design, but far more advanced and fitting to the time.