The location of map and terrain files:

If you are using an FTP client:
outgoing/releases/Focus/vaisala-map-data

If you are using a web browser (not recommended for these large files)
ftp://ftp.sigmet.com/outgoing/releases/Focus/vaisala-map-data/


File versions to use:
IRIS Focus versions 2.0, 2.1, 3.0 :              use vaisala-iris-maps-v1.zip & vaisala-iris-terrain-v1.zip
IRIS Focus versions 4.0, 5.0, 5.0.1, 5.1.0, 5.1.1, 5.2.0, 5.3.0, 6.0, 6.1 :     use vaisala-iris-maps-v2 & vaisala-iris-terrain-v2