The basic goal of this project was to analyse how the usage of non-conventional data (i.e. 'data of opportunity') in conjunction with conventional data could help improve the estimation of parameters for weather and space weather. Conventional data it is considered to be data coming from well-known sources such as permanent GNSS receivers (e.g. receivers from IGS or EUREF networks) while non-conventional data is considered to be GNSS data from research vessels or mass-market GNSS receivers (such as smartphones or other single-frequency GNSS chipsets).