I got certified to do tropical dives. So I only dove once or twice a year. On my last dive trip (bdb-before DiveBuddy) my skills were so rusty, that I had a miserable time diving in beautiful Maui. When I came back from that trip, I knew I had to do some local (shudder) cold water diving to keep my skills up. As none of my friends or family were divers, I did an online search for local dive clubs and dive buddies to find someone who knew the local dive sites. Diving locally and taking a buoyancy class improved my diving so much that on my next trip an instructor I was diving with thought I had at least 200 dives under my weight belt (I had maybe 60 at the time).