Unless they're under NDA I don't really think Garmin has much of a say about that. A J2EE app server stack with AJAXy client side doesn't exactly seem like it would qualify for trade-secret protection.
Making use of Garmin's trademarks (even indirectly, e.g. "gcteam") or other intellectual property, or giving out example logins to the production website ... those things seem much more problematic if the relationship with Garmin goes south.
I've never heard of anyone getting slammed for discussing implementation details absent an NDA, unless there was source code or other obviously-proprietary IP involved.
Making use of Garmin's trademarks (even indirectly, e.g. "gcteam") or other intellectual property, or giving out example logins to the production website ... those things seem much more problematic if the relationship with Garmin goes south.
I've never heard of anyone getting slammed for discussing implementation details absent an NDA, unless there was source code or other obviously-proprietary IP involved.