The Chelyabinsk meteorite fragment that landed in the Chebarkul lake in Russia on 15 February 15 2013 weighed over half a ton. We provide magnetic field maps that were obtained during underwater measurements above the fragment. The data acquisition process was multiple GPS referenced magnetic surveys 0.5 m – 1 m above the top of the lake sediment layer at 10 m water depth. Gradiometric configuration of the survey using two tri-axial fluxgate magnetometers helped to suppress local geological anomalies. The location of the ice crater and the underwater magnetic anomaly provided final meteorite landing coordinates, which were made available during meteorite recovery.