It might be a fine line to walk with the definition of "other identifiers" here (especially with a BSSID), particularly when RFID tags count as personally identifiable.
> Natural persons may be associated with online identifiers provided by their devices, applications, tools and protocols, such as internet protocol addresses, cookie identifiers or other identifiers such as radio frequency identification tags. This may leave traces which, in particular when combined with unique identifiers and other information received by the servers, may be used to create profiles of the natural persons and identify them.
How bizarre that you're being downvoted. This is probably the most useful comment in this thread. The answer is in the first line:
WiFi maps do not fall within the scope of existing European privacy legislation. They do not consist of ‘location data’ as defined by the E-Privacy Directive, nor do they consist of ‘personal data’ under the Data Protection Directive, except in highly unusual and very rare circumstances.
