b5m users can report mapping problems.
Therefore, if you identify a problem on the mapping of the Gipuzkoa Spatial Data Infrastructure (e.g. incorrect address of a building, no building at all, incorrect name of a street, no street at all, etc.), and want to let us know, go to b5m's classic viewer, place yourself where you encountered the problem and click TOOLS > Report a problem.
Next, click where you found the problem, and follow the link at the top of the map. A new window will open containing the form you must fill in with the problem details. You can also provide us your email address if you want for us to communicate the status of the problem to you; this will also help us get in contact with you in case we need further details on the problem you have identified.