That's interesting ef , there is a video on youtube that talks about how there is a positive charge and a negative charge between the bee and the flower, once the bee visits the flower the charge in the flower changes for a period of time and thus letting other bees know it was recently visited. So I can see how it is totally possible that it is being used as a tool for navigation. Check out the video if you haven't seen it. It's a two part video but very interesting and touches on some of the things in this article. Let me know what you think!