Efficient data acquisition methods can save time and money in field measurements. As most field data in aquatic systems is time dependent, it is important to minimize sampling errors as measurements for a certain time and place cannot be re-taken. For larger measurement campaigns with different teams at distributed sampling sites, information about data from other teams as well as environmental data like gauge, tidal or upstream weather information could help to interpret measurement results already on site. We propose WODCA (Water Observation Data Collecting Application), a mobile, online measurement support system. The measurements are sent wirelessly to a geographic database that provides back an integrated view on already taken measurements of all mobile parties, augmented with online environmental data like gauge data or tidal information. This eases the collaboration between different mobile measurement teams. GPS integration and map based data input can help to avoid location errors. The proposed system could assist materially in the improvement of field data quality and sampling comfort.