Fishnet Echo Sounders (Net Sounders)

Attention:

Please note that operations of the Fishnet Echo Sounders requires experienced scientific staff on board and can only be operated upon request. The system is not operated by the ship's crew. Request operations with the Fishnet Echo Sounders to AWI-Logistics in sufficient time prior to the cruise and clarify the data transfer after the cruise.

Summary

The net echo sounders are used for information about the status of fishnets deployed in the water. Information about depth of the net, distance to seabed and amount of fish coming in are provided. Small sensors are attached to the trawl and deliver data to the ship where they are received by hydrophones.

Manufacturer	Scanmar
Model	SS4-VTL, Minitransponder MTR-144
Serial No.	n/a
Type	echo sounder

Transducer Frequency

40,8 - 44,8 kHz

Contacts

Name	Institution	Role
Ralf Krocker	Alfred-Wegener-Institute for Polar and Marine Research	Engineer In Charge

Components

The transducer of the Scanmar Fishnet Sounder system and the battery charging equipment are stored in the Umformerraum. Two hydrophones are permanently installed on the hull of the ship. Working places are situated on the bridge and in the Messraum. ScanBas System is installed on the PCs. It analyzes and visualizes the data.

Name	Model	Type
hydrophone starbord		not assigned
hydrophone portside		not assigned

Position

Origin Description:

no xyz-position given. The devices are stored in the Umformerraum in the forecastle.

Data logging, storage and archiving

Logged parameters

Parameter	Sensor Output Type	Unit
depth of trawl	depth	m

Central geographical ship's position and time standard

The Scanmar system receives GPS and time information from the active scientific GPS receiver (usually Trimble) via the the GPS distribution. The data are stored in the NMEA data stream of the Scanmar system

Rawdata storage on board

The Scanmar data are made available via a terminal server. To access the data use any TCP/IP client program e. g. PuTTY or Hyperterminal. For further instructions see manual "Scanmar_datarecording_FIELAX.pdf". The data recorded from Scanmar is in NMEA format and can be converted using the software KonvScanbas.exe. The Scanmar data are not transferred to DShip.

root directory	operators choice\|
directory name	operators choice
file name	suggested name for NMEA data: Cruise No.-YYYY-MM-DD.txt

Data archiving on land

After consultation with the data scientist and AWI Logistics the Scanmar data including meta data may be transferred to PANGAEA (https://www.pangaea.de/).

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