How can I find out if my husband's home golf course is on the garmin approach s1?

I'm not to familiar with the Approach S1, but if it is a recent model, a call to Garmin support should help. Ive called other manufacturers for their course list, and they directed me to a slew of little-published resources about the product. Try 1-800-800-1020 in North America, and to the link in the sources for all European countries. If you live in Antarctica I believe you are out of luck. A call is worth a shot.