The Teledyne Webb Research product APEX is an autonomous neutrally buoyant drifter. It uses a variable buoyancy engine to surface on a programmed schedule, tracing basin-scale circulation and returning profile measurements via satellite. APEX has active depth control, and carries state of the art salinity sensors.

It is used in support of the international ARGOS program by 19 nations.

KEY FEATURES:

• Provides autonomous profiles from depths to 2000 m
• Endurance – 4 years, 150 ascents
• Telemetry options: ARGOS and IRIDIUM
• With automated self-tested software
• Dimensions: 16.5 cm (diameter) x 127 cm (long) + 69 cm (antenna)

Sensor options:

• Pumped CTD – Seabird 41
• Oxygen – Seabird IDO
• Oxygen – Aanderaa Optode 3830
• Acoustic Receiver – RAFOS
• Fluorescence, Turbidity – Wet Labs FLNTU