There aren't forums here for every device. If you have problems with devices not mentioned and if the query isn't applicable to other forums, eg BaseCamp, then you could try the FAQ knowledge base 24/7 here: https://support.garmin.com/support/searchSupport/search.htm
If you prefer to email product support or speak to someone live on the phone, you can find contact info and hours here: http://www.garmin.com/us/support/contact
There are also market-specific Facebook pages and Twitter accounts
Garmin on Facebook and Twitter
Garmin Fitness on Facebook and Twitter
Garmin Outdoor on Facebook and Twitter
Garmin Fish & Hunt on Facebook and Twitter
Garmin Marine on Facebook and Twitter
Garmin Aviation on Facebook and Twitter