You're on to something there... wanting to be less intrusive. Please don't take this the wrong way, but you'd be better off doing some scouting pre-season and have a few spots picked out you can ride your bike to to hunt, instead of riding around and stopping in random spots blowing locator calls. I've lost count of how many times I've been working a bird, or trying to work a bird when I hear someone out at the road blowing a locator. More often than not the bird will shut up and move on, or start gobbling again 30 minutes later when locator call guy is 7 miles down the road.