... Insufficient number of suitable radio sources (VLBI). ... Uneven distribution of sources over the sky Uneven distribution of errors in source position over the sky Proper (physical) and apparent (instrumental and analysis) source motions Source structure and its variability Dependence of source positions on: the wavelength analysis strategy models used during analysis observing network (= baseline diversity is needed Increase # of the core sources up to 410 (one per 100 sq. deg.) ...

... LOCATION . ... The administrative centre, the library, scientific laboratories, computer center, hotel and apartment houses of an observatory are located in the settlement Nizhnij Arkhiz , which is situated in 25 kms to the south from a village Zelenchukskaya. ... It is desirable to come on conference by the following types of transport: . ... During the conference period it is supposed to conduct a public meeting of the section "Sun" with discussion of results of the researches made in 2005. ...