SeaSPYMarine Magnetometer

Marine Magnetics is the only marine magnetometer company in the world that can producestable Overhauser sensors that do not degrade with time.

SeaSPY, the product we launched over 10 years ago, was designedto pick up where traditional marine magnetometers le o. Initialresearch and our sales since then tell the same story: surveyorswant a mag they can rely on. SeaSPYs mandate was to help survey-ors save time, money, and energy by taking the realities of workingin the eld into account.

RuggedSmart connectore SeaSPY connector is a custom brass underwater connectorthat supports a tonne of towing force. A PVC nose cone protects itfrom side impacts, while maintaining a streamlined tow body. Wehave never lost a SeaSPY from the connector, except for the timesomeone threw one overboard without connecting it to the cable.While theres some human error no mag can account for, the storyhas a happy ending: the customer went back a year later and foundtheir SeaSPY in working condition.

Sleek DesignSeaSPYs sleek design resists snags. e inexpensive and eld replace-able tailns are the only protruding element, and they are designedto snap o should they ever get snagged on rocky outcroppings.

Reliabilitye SeaSPY towsh is made of " super strong berglass coatedwith a bumper layer of polyurethane for extra shock absorption.

Should even a drop of water penetrate the towsh, a leak detectorwarning appears on your screen to inform you. Call us over-protective, but in the event of a breach, SeaSPYs electronicsmodule is encased in a polycarbonate housing with O ring sealsfor another layer of security.

e sensor itself is suspended on shock mounts to ensure the quality ofyour data isnt inuenced even if you drag SeaSPY along the sea oor.

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A quick glance self diagnosticLED system on our isolationtransceiver can save you hours offrustration. If all your connectionsare hooked up properly, a statusLED will glow green. If theres aproblem with one of the connec-tions, it will glow yellow. If theresa short somewhere, it will glowred, and the transceiver will safelyshut down the output power inmicroseconds. A blue LED asheswith every mag reading.

VersatilityAll innovations are backward compatible.Everything we do to improve our productsapplies to the ones in the eld.

Better DataWorldwide Operationwith No RestrictionsSeaSPY will collect accurate data no matterwhere you are or in which direction youare surveying. is is not the case withoptically pumped magnetometers whichhave dead zones and must be oriented at aspecic angle relative to the earths mag-netic eld. is issue can be particularlyproblematic in equatorial regions whereyou cannot collect data in every direction.

Highest Absolute AccuracySeaSPY Overhauser sensors have the highestabsolute accuracy of any magnetometer:0.1nT.

e repeatability between SeaSPY sensorsis also unmatched at better than 0.01nT.

Proven Sensitivity SpecsA world authority belonging to INTER-MAGNET has independently tested andconrmed our specications: 0.01nT/Hz;counter sensitivity is 0.001nT.

Eliminate Shifts In Your DataHeading error is a noticeable oset in themagnetometer output caused by changingthe heading of the magnetometer withinthe Earths magnetic eld.

Since SeaSPYs Overhauser technologydoes not display heading error, no matterhow the sensor is oriented in the Earthsmagnetic eld, successive survey linestaken in opposite directions will matchup perfectly.

e benets to the user are four-fold1. Targets will not be missed because they

fall between mismatched survey lines.2. Reduces post-processing. Competing

technologies require the user to collecttie lines in order to level the data set(match-up inaccurate survey lines).

3. ere will be no variation introduced inthe data by slight course changes duringa survey line.

4. A magnetic map of an area will look thesame, regardless of direction in whichthe survey lines were conducted.

Stable Timee clock used in the SeaSPY electronicsmodule is accurate to 1ppm throughoutthe entire temperature range, (as opposedto 100ppm found in competing magne-tometer systems) so it will be accuratelytime stamped to sync with diurnalcorrection (base station) information.

Maintenance Free SensorsSeaSPY sensors dont degrade withtime, so youll get the same qualitydata aer 10 years of use as you didthe rst time you used it.

In addition SeaSPY sensors containno consumable parts, so you wonthave to replace anything, like theexpensive lamps that wear out inoptically pumped mags.

Overhauser EffectSeaSPY is a pulsed Overhausermagnetometer that measures the

ambient magnetic eld using a specializedbranch of nuclear Magnetic Resonancetechnology, applied specically to hydro-gen nuclei.

Please see our Application Guide for details.

Ease of UseUltra Low Power ConsumptionA SeaSPY system only requires 1Wstandby and 3W maximum. As a result,SeaSPY can run for days directly from a12V or 24V vehicle battery.

No temperature eect on accuracySeaSPY works equally well in cold, deepwaters as tropical waters, starting instantlyon power-up without requiring warm up.And data collected at 40C will be identicalto data recorded at +60C.

Integrate with side scans andother plaformsAn easy all in one solution to integrateSeaSPY with side scans. A single 10m towcable is terminated with everything youneed. No modications to your magne-tometer or gradiometer are required.Simply swap out your tow cable for theintegration cable and you are ready to go.Best of all, your accessories, includingpower supply, are still compatible.

e integration maintains the basic systemintegrity of each product, ensuring they canboth run independently as well as together.

Horizontal or Vertical Transverse GradiometerMarine Magnetics transverse gradiometers provide a rigid 2mstructure linking the sensors, and are well suited for close-inprecision surveys for small ferrous targets where short sensorseparation is needed.

ApplicationsCable and Pipeline Survey A horizontal transverse gradiometercan be used to track cables, or pipelines in real time from relativelyhigh towing altitudes.

Detection of Small Ferrous Targets Short baseline gradientmeasurement in any direction (longitudinal, horizontal, or vertical)is useful for eliminating geological interference and diurnal variation.

Longitudinal GradiometerLongitudinal gradiometers provide the largest variation in availablebaselines, from 1.5m to 500m+. Again, Marine Magnetics commu-nication transceiver technology is unmatched in its ability to supportextremely long distances between the two towsh. Long baselinesprovide superior gradient measurement sensitivity and increaseddetection range. Longitudinal gradiometers are also extremelyhydrodynamically stable when deployed.

ApplicationsShipwreck, Search and Salvage Medium baseline longitudinalgradient measurement can eliminate interference by geologicalbodies, while highlighting massive magnetic sources like steel hulls,boilers or engines. Smaller sources such as anchors or cannons willrequire a shorter baseline, and lower towing altitude.

Environmental Survey Medium baseline measurement with a long-itudinal gradiometer can highlight shallow magnetic sediments,while eliminating deeper geological inuences. e baseline shouldbe on the order of magnitude of the expected towing altitude.

Exploration Geophysics Long-baseline measurement with a long-itudinal gradiometer is ideal since the bodies of interest are oenfar from the sensor, and produce very small gradients. e baselineshould be on the order of magnitude of expected depth-to-source.

Gradiometer ConfigurationsSeaSPY sensors are highly accurate and repeatable, making them ideal for gradiometers

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A magnetic gradiometer measures magnetic gradient in one dimension by subtracting thedifference between two independent magnetic sensors. Since the Earths magnetic field is three

dimensional, up to three independent gradient directions can be measured vertical, horizontal (across-track) and longitudinal (along-track).

Marine Magnetics offers each of these gradiometer configurations. In addition, all SeaSPYmagnetometers are compatible, enabling existing SeaSPY customers to upgrade theirmagnetometer to the gradiometer configuration of their choice, as they need to.

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Operating Zones NO RESTRICTIONSSeaSPY will perform exactly according to spec throughout the entire range.

Absolute Accuracy 0.1nTSensor Sensitivity 0.01nTCounter Sensitivity 0.001nTResolution 0.001nTDead Zone NONEHeading Error NONETemperature Drift NONEPower Consumption 1W standby, 3W maximumTimebase stability 1ppm, -45C to +60CRange 18,000nT to 120,000nTGradient Tolerance Over 10,000nT/mSampling Range 4Hz 0.1HzExternal Trigger By RS-232Communications RS-232, 9600bpsPower Supply 15VDC-35VDC or 100-240VACOperating Temperature -45C to +60CTemperature Sensor -45C to +60C, 0.1 step

TowfishTowfish Length 124 cm (49 inches)Towfish Diameter 12.7 cm (5 inches)Towfish Weight in Air 16 kg (35 lbs)Towfish Weight in Water 2 kg (4.4 lbs)

Tow CableConductors Twisted pairStrength Member VectranBreaking Strength 2,500 kg (5,500 lbs)Outer Diameter 1 cm (0.4 inches)Bending Diameter 16.5 cm (6.5 inches)Weight in Air 125 g/m (84 lb/1000 ft)Weight in Water 44 g/m (29.5 lb/1000 ft)Outer Jacket Yellow PolyurethaneCable Termination Field Replaceable

Floatation CableConductors Twisted pairStrength Member VectranMax Working Load 2,500 kg (5,500 lbs)Outer Diameter 1.9 cm (0.74 inches)Bending Diameter 25 cm (10 inches)Weight in Air 272 g/m 183 lbs/1000 ft)Weight in Water -20 g/m (-13.5 lbs/1000 ft)Outer Jacket Orange PolyurethaneCable Termination Field Replaceable

SpecificationsSeaSPY system consists of:SeaSPY Towsh includes Depth rating 1000m (1500psi), 3000m (5000psi), 6000m

(9000psi) customer specied. Overhauser Sensor Electronics module containing all of the driving

electronics and Larmour counter Leak detector to let you know if even a drop of water

penetrates the towsh 4 lead weights to increase the weight of the towsh and

to prevent it from rotating. To adjust the weight you canremove or add additional weights in the eld.

SeaLINK data acquisition and GPS logging sowarefor Windows. See our SeaLINK brochure for moreinformation.

Tow Cablee cable is made up of one twisted pair of conductors,a Vectran strength member, water block and yellow poly-urethane jacket. Length determined by customer.

Isolation TransceiverDimensions: 11 x 6 x 3 cm (4 x 2 x 1") Weight: 130 g (0.28 lbs)

RS-232 cable

Battery Clip Cable or Power Supplye power supply accepts any AC line power, from 100-240VAC and 50/60 Hz to provide conditioned and clean 24VDC power. Weight 165g (0.36lbs)

Options Pressure Sensor Altimeter Transponder SideScan integration Depth options: 3000m, 6000m Extension cables Change the weight of the towsh with additional weights Deck cable Termination kit Winches

We have now completed the first full Antarctic season using our SeaSPY magnetometerand can report that we are delighted with its performance.

It has proved to be very robust and trouble free in operation and has delivered consistentlygood data. There is no doubt that we chose the right instrument.

Peter MorrisBritish Antarctic Survey