Workshop Conclusions and Recommendations Workshop Final Report Sea level measurements often need to be carried out in what can be characterized as harsh or hostile environmental conditions. A significant part of the seas on the planet are covered with ice either on permanent or seasonal basis. Many of them, in addition, often experience storms and high waves. Biological/environmental/logistic factors as well as increasing requirements and expectations for performance can add to the challenges of operating a sea level measurement station in these conditions. The topic of sea level measurements in hostile conditions was first addressed by Global Sea Level Observing System (GLOSS) in 1988 at an IOC sponsored workshop in Bidston (UK). The Group of Experts of GLOSS has recommended to revisit the issues and to convene a new workshop which would review inter alia new measurement systems, instrument-protecting technologies, data transmission, GNSS and summarize the gained experience. The objectives of the workshop will be: • to exchange information and review techniques and technology for making sea level measurements in hostile regions and conditions; • to identify the advantages/disadvantages of available sea-level measuring technologies and new technologies required to extend existing capabilities; • to assess the potential to implement the sea-level network in hostile regions to meet the requirements of the Global Sea-Level Observing System. Presentations and/or posters are invited on experiences of sea level measurements in hostile conditions of icy or/and stormy environment. Based on the contributions the workshop will aim to review and update the recommendations given in 1988. The workshop will be held at the State Oceanographic Institute, Roshydromet, 6, Kropotkinskiy Lane, 119034, Moscow, Russian Federation. Registration: Advanced registration is needed to attend the symposium. There is no registration or attendance fee. We kindly ask for submissions of a title (abstract) and firm attendance commitment by no later than 15 January 2018. Abstracts should be submitted to Thorkild Aarup (t.aarup@unesco.org) with copy to Elena Iasyreva (e.iasyreva@unesco.org). Visas: Most participants will need visas to travel to Russia. Visa support for the workshop participants will be provided by local organizers. To this end the participants are requested to send the filled-out visa support forms and scans of the first page of their national passports (as described in the visa form) to Alexander Postnov (Alexander.postnov@mail.ru) not later than 1 February 2018. Hotels: There are several middle-class hotels in proximity of SOI. Please consult the Workshop Logistics document.