General Help from OCAD Website : The HowTos section is particularly valuable.
Geo-referencing an OCAD map : April 2010
Using a GPS with OCAD April 2010 includes section on Garmin Custom Maps
Notes on using Course Planning with OCAD 9 Updated March 2010
If you are a visual learner and like lots of screen shots you will like Neil Crickmore's (UK Orienteer) introduction to Course Planning with OCAD 9 Updated 2008
Setting up and managing Master Maps April 2010, Updated Sept 2011 to suit OCAD 10 plus considerable revision and samples
Sourcing high quality low cost Aerial Photography updated 3rd May 2013