Replace root logger calls with module-specific loggers

providers/sigrefdata/iota.py

@@ -8,6 +8,8 @@ from providers.sigrefdata.file_download_sig_ref_data_provider import (
     FileDownloadSIGRefDataProvider,
 )
 
+logger = logging.getLogger(__name__)
+
 
 class IOTA(FileDownloadSIGRefDataProvider):
     """SIG ref data provider for Islands on the Air"""
@@ -31,7 +33,7 @@ class IOTA(FileDownloadSIGRefDataProvider):
                 try:
                     grid = latlong_to_locator(latitude, longitude, 6)
                 except ValueError:
-                    logging.debug(
+                    logger.debug(
                         "Error converting lat/lon to locator for an IOTA reference %f %f",
                         latitude,
                         longitude,