Hi Mike, I think MdxFile should use Logger.defaultLogger.error() and maybe LblFileReader should use Logger.defaultLogger.warn() (as in attached patch).. Just my feeling, can't prove anything. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Mike Baggaley <mike@tvage.co.uk> Gesendet: Sonntag, 11. April 2021 16:10 An: 'Development list for mkgmap' Betreff: [mkgmap-dev] More logging Hi Gerd, Here is the next patch. This one moves a number of messages from writing to stdout/err to using logging. There are several files changed, but most have only very small changes. I'd be interested to know what the message "Map has tide prediction, please implement" in LBLFileReader means... Cheers, Mike