You need a SIOS user account if
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you are active in a working group, or committee
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you are member of the SIOS GA or BoD
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you want to add/edit an item in the Observation Facility Catalogue
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you want to add a request or offer in the Logistics Sharing Notice Board or EO-RS forum
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you want to use advanced Data Portal functions (name it please)
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If you want to use the 'save as draft' function in your webform/application.
You do not need a SIOS user account if you want to
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submit an application /proposal to a SIOS call (without using the 'save as draft' function)
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access/search on the Data Portal or download data
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apply for a training course