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APEX (Autonomous Profiling Float)

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APEX is a autonomous drifting profiler used to measure subsurface currents and make profile measurements. It surfaces at programmed intervals for data telemetry and geo-location via ARGOS or IRIDIUM satellite. Standard sensors include TP and Salinity; other sensor options are available (see below).

APEX has a 4-year life and can surface approximately 150 times from a maximum depth of 2000 meters. Over 6000 APEX floats have been delivered to users in 19 nations. Floats are provided deployment-ready, and are routinely deployed from merchant ships (VOS) while moving at 20+ knots.

Customer Stories
  • Dimensions: 16.5 cm in diameter x 127 cm long (not incl. 69 cm antenna)
  • Mass: 25 kg
  • Autonomy nominal: 4 years, 150 ascents
  • Operating depth: 2000 meters maximum, programmable. Typically 100 TP or 50 CTP points at 5-10 m.
  • Profile sample rate: interval resolution limited by telemetry data rate rather than APEX design