Fig. 1

Representation of the i-Pilot tag (A), G-Pilot tag (B), Sicklefin devil ray (250 cm disc width) tagged with the i-Pilot (C), and blue sharks (250 and 280 cm total length) tagged with G-Pilot tag (D). 1—wildlife computers SPOT 363A transmitter; 2—ATS VHF radio transmitter F1835B; 3—wildlife computers SPLASH10-F-297A; 4—titanium housing (camera, IMU, PCB. Battery, pressure and temperature sensors); 5—CATS IMU; 6—red LED; 7—magnetic paddle wheel; 8—stabilizing fins; 9—tow connection; 10—ballast; 11—tow connection