EXPLORER-MK-II-information.pdf

Sea Scan® ARC Explorer Mk II Dual Simultaneous Frequency | Stainless Steel | Adjustable Transducers

The ARC Explorer Mk II is the newest generation of Marine Sonic’s towed side scan sonar designed for search, survey, and recovery applications. The Adaptive CHIRP Technology provides the highest imaging quality possible from a side scan sonar and supports ranges up to 60 % greater than non‐Adaptive CHIRP systems. The high resolution imaging and simultaneous dual frequency operation, in conjunction with an adjustable tow point and variable transducer angle, make it an ideal tool for survey and infrastructure inspection applications that require a high level of flexibility. The rugged construction and a 300 m depth rating all in a one‐man portable system also make it an ideal tool for the search & recovery and security communities.

ARC Explorer Towed Side Scan Sonar

Marine Sonic Technology

Search & Recovery (Victim & Evidence)

Security Scans for Piers, Docks, & Bridges

Civil Infrastructure Inspection

Salvage, Treasure, & Diving Surveys

Terrain Mapping & Obstruction Surveys

Offshore Infrastructure Inspection

Archaeological & Biological Surveys

Vessel Hull Inspections

Applications

Dual Simultaneous Transmission

Adaptive CHIRP

Altimeter / Depth Sensor

Stainless Steel Construction

Variable & Modular Design

Robust Nose and Fin Design

100 m & 30 m Cables Standard

One Man Portable

Key Features

A rugged stainless steel tow fish, portable watertight topside processor and a user choice of ruggedized laptop all interconnected with a twisted pair Kevlar tow cable make up the core of the ARC Explorer Mk II system. To best suit different user applications two standard dual frequency options are available. The 600 / 1200 kHz option provides the ideal compromise between high range and high resolution, whereas the 900 kHz / 1800 kHz option is optimized for applications that require ultra‐high‐resolution imagery for detecting very small targets in the first survey pass reducing time and cost.

Further, 150 kHz and 300 kHz low frequency transducer options are available. The small form factor of all system components as well as the weight optimized design make the ARC Explorer Mk II ideal for one‐man operation on small vessels of opportunity. The 30 m and 100 m lightweight Kevlar tow cables included with the Mk II provide flexibility for different applications and simplified cable management on those smaller platforms. Customer‐specified lengths are also available. Like all Marine Sonic Technology products, the ARC Explorer Mk II comes with the user‐friendly and self‐ explanatory Sea Scan Survey acquisition and review software.

Attachment C

ATLAS NORTH AMERICA LLC

120 Newsome Drive, Suite H P.O. Box 1309 Yorktown, VA 23629 | United States

Follow us online:

www.linkedin.com/company/marine‐sonic‐technology/ www.facebook.com/marinesonic

Phone: +1.757.463.0670 Telefax: +1.757.463.0673 info@na‐atlas.com www.marinesonic.com

Sea Scan® ARC Explorer Mk II Full Flexibility | Low Lifecycle Costs | Great Customer Service

We Pride ourselves on our Customer Support.

Free 24hr Tech Support

Free Factory Training

Free Software Upgrades

3‐year limited warranty

The above image of the Betsy, known as YO88 sunk in 1781, Yorktown River, was taken with the ARC Explorer Mk II using 1800 kHz transducers at a 30 m Range. The corrugated steel cofferdam is clearly visible around the wreck highlighted by the density of the steel. The less dense elongated concrete blocks protecting the top of the wreck resemble the ship’s deck and can be distinguished from the steel.

The ARC Explorer Mk II employs dual simultaneous frequency operation with user selectable range and range delay settings per frequency. The integrated variable angle tow point and transducer angle adjustments are ideal for survey inspection of bridges, piers, harbor walls and offshore platforms as well as vessel hulls. Options include a depressor, keel weights, and a pole mount and a variety of customization options including magnetometer integration, and build‐to‐order tow fish designs. Modular construction minimizes maintenance costs and maximizes upgrade capabilities.

The ARC Explorer Mk II includes a quick‐release safety mechanism to prevent the loss of the tow fish should it strike an object during the survey.

Towfish Specifications

Construction Stainless Steel & Polymer

Dimensions Diameter 9.5 cm / 3.75 in x Length 113 cm / 44.5 in

Weight 22 kg / 49 lbs

Depth Rating 300 m / 984 ft

Tow Cable Specifications

Construction Twisted Pair with Kevlar Strength Member

Length Options 30 m to 500 m / 98 ft to 1640 ft

Bend Radius 10 cm / 4 in

Strength 340 kg / 750 lbs, Safe Working Load

Topside Comunications Unit Specifications

Construction IP68 Watertight Enclosure

Dimensions 24 cm x 16.5 cm x 9 cm /

9.5 in x 6.5 in x 3.5 in

Connections Ethernet / Towfish / Power

Power 12V ‐ 30V DC, 100V ‐ 200V AC with Adapter

Acoustic Specifications

Across Track Resolution 0.4 cm to 1.5 cm

Horizontal Beam Angle 0.4° (one‐way), < 0.3° (two‐way)

Vertical Beam Angle 24° (two‐way)

Transmit Pulse Technology

Marine Sonic Technology Adaptive™ CHIRP

Transmit Pulse Bandwidth

50 to 200 kHz

Transmit Pulse Length < 0.5 ms

Data Collection Speed 5.3 Knots Max.

(4.7 Knots @ 100 m Range)

Frequency Specifications

Frequency Max Range (per side) Along Track Resolution

150 kHz 500 m / 1640 ft 60.8 cm

300 kHz 250 m / 820 ft 30.4 cm

600 kHz 140 m / 460 ft 15.2 cm

900 kHz 80 m / 262 ft 10.0 cm

1200 kHz 45 m / 148 ft 7.5 cm

1800 kHz 25 m / 82 ft 5.0 cm