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Geo Magnetic Head

Geo Magnetic Head

Detecting metal buried in the sediment

Possibility of towing equipment behind the SeaCat by attaching the tow cable to the strain-relief of the fibre-optic cable

Video
Gallery
  • The picture shows a sample data which has been recorded in the harbour of Olpenitz in the Baltic Sea.
  • The picture shows the SeaCat with Geo Magnetic Head before launch.
  • The path of the vehicle is shown as light green line; the data has been overlaid to a satellite image of the area.
  • It is clearly visible that the concrete dock structure increases the magnetic intensity in shape of a distributed noise. In contrast, there is a strong magnetic contact close to the end of the survey.
  • The picture shows The SeaCat on a Geo Magnetic survey.
 
Further Information

The Geo Magnetic Head comes as a complete set, consisting of a SwapHead with cable intake, a towed magnetometer and a cable guidance system.

The G-882 Marine Magnetometer is particularly well suited for the detection and mapping of all sizes of ferrous objects.

These include:

  • anchors,
  • chains,
  • cables,
  • pipelines,
  • ballast stones
  • other scattered shipwreck debris,
  • munitions of all sizes (UXO),
  • aircrafts,
  • engines and any other object with magnetic expression.

 

Objects as small as a 5-inch-screwdriver are readily detected, provided that the sensor is close to the seafloor and within practical detection range.

The typical detection ranges for common objects are as follows:
Ship 1000 tons 0.5 to 1 nT at 800 ft (244 m) 1000 lb bomb 1 to 5 nT at 100 ft (30 m)
Anchor 20 tons 0.8 to 1.25 nT at 400 ft (120 m) 500 lb bomb 0.5 to 5 nT at 50 ft (16 m )
Automobile 1 to 2 nT at 100 ft (30 m) Grenade 0.5 to 2 nT at 10 ft (3 m )
Light aircraft 1 to 2 nT at 100 ft (30 m) 20 mm shell 0.5 to 2 nT at 5 ft (1.8 m)
Pipeline (12''”) 1 to 2 nT at 200 ft (60 m) Screwdriver (5”'') 0.5 to 2 nT at 12 ft (4 m)
Pipeline (6”'') 1 to 2 nT at 100 ft (30 m ) 10 lbs of iron 0.5 to 1 nT at 20 ft (6 m)
100 kg of iron 1 to 2 nT at 50 ft (15 m) 1 lb of iron 0.5 to 1 nT at 10 ft (3 m)
100 lbs of iron 0.5 to 1 nT at 30 ft (9 m)