This data logger records up to 2 data streams onto a USB stick. This may be two NMEA0183 feeds, or with the Seatalk converter one NMEA0183 and one Seatalk. Seatalk messages are encapsulated within a NMEA sentence. Power is 12/24V DC. The two data streams are multiplexed into a single file of NMEA0183 data, and data is recorded as soon as the device is switched on.

The logger is available for purchase (we no longer have funding to supply them on free loan).

Although initially designed explicitly for TeamSurv, it is also being used in many other applications where it is necessary to record NMEA0183 data, for example:

• Race yacht data logging
• ASV/USV data logging
• Wind instrument data logging
• Borehole logging
• NMEA0183 diagnostics and analysis for field engineers

Installation

The device is not waterproof, so install in a dry location. Allow 90mm clearance at the USB end, to allow USB sticks to be inserted and to give access to the On/Off button. Secure in place with 4 M3.5 or M5 countersunk machine screws, 3M Dual Lock or similar.

Connect 12/24V DC power. There is an internal self-resetting fuse, so no inline fuse is required. Power is typically taken from the same circuit as the instruments, and can be taken from the Seatalk bus if the Seatalk option is used. Connect the NMEA and/or Seatalk data wires, insert a USB memory stick, and check the LEDs to ensure correct operation.

For connection instructions for specific instruments, refer to the NMEA0183 Installation Guides.

Operation

On power up, a new log file is created on the USB stick, and data is written as it arrives, multiplexing the two data streams into the one file. NMEA sentences are not tagged to show which port they came in on, nor are they time stamped.Seatalk sentences are embedded within a proprietary NMEA sentence, e.g. $PTSV,SEATALK,0105FA0300300703*8A is output for the Seatalk packet 0105FA0300300703.

To remove the USB stick, either power off, or press the button by the USB stick to ensure data is correctly written - failure to do this may corrupt all data on the USB stick.

Specification

Standards
	This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation.
	Compliant with 89/336/EEC Electromagnetic Compatibility Directive, amended by 92/31/EEC & 93/68/EEC and 72/23/EEC Low Voltage Equipment Directive, amended by 93/68/EEC
WEEE Directive (2002/96/EC)	Governments, customers and the public are increasingly interested in the proper disposal of used electronics. The European Union (EU) has developed the WEEE (Waste Electrical and Electronic Equipment) Directive to ensure that systems for collection, treatment and recycling of electronic waste will be in place throughout the European Union. Instructions for Disposal of Waste Equipment by Users in Private Households This symbol on the product or on its packaging indicates that this product must not be disposed of with your other household waste. Instead, it is your responsibility to dispose of your waste equipment by handing it over to a designated collection point for the recycling of waste electrical and electronic equipment. The separate collection and recycling of your waste equipment at the time of disposal will help to conserve natural resources and ensure that it is recycled in a manner that protects human health and the environment. For more information about where you can drop off your waste equipment for recycling, please contact your local city office, your household waste disposal service or the shop where you purchased the product. Instructions for Disposal of Waste Equipment by Other Users For users of our equipment, other than private households, we will provide free recycling of all electronic equipment once a customer has returned the equipment to us and where a replacement product is being supplied by us, on a one for one, like for like basis.
RoHS Directive (2002/95/EC)	The Restriction of Hazardous Substances in Electrical and Electronic Equipment (RoHS) Directive was passed into law by the European Union (E.U.). It affects manufacturers, sellers, distributors and recyclers of electrical and electronic equipment containing lead, cadmium, mercury, hexavalent chrome, polybrominated biphenyl (PBB) and polybrominated diphenyl ether (PBDE). All of our products and packaging materials are fully RoHS-compliant.

Seatalk Option

The Seatalk option is a plug-in module that replaces one of the NMEA0183 inputs with a Seatalk one, converting the Seatalk electrical signal to an RS422 one. The firmware in the data logger then wraps the Seatalk datagram into a NMEA sentence in the form $PTSV,SEATALK,datagram,*cc, where "datagram" is the Seatalk data, and "cc" is the standard NMEA checksum. The Seatalk protocol has been reverse engineered by Thomas Knauf, who has published the Seatalk specification online.