Pat, not sure I can answer in a post, here on the notebook. I need to get out my unit and look. I can tell you it has nothing to do with decimal places but Lat./ Lon. format. Where are you located? Sorry it took me so long to notice this post. You've probably already figured it out.
Lowrance Pro Staff,
Wave Spin Reels Pro Staff,
Yeti Pro Staff, Costa Del Mar Pro Staff. Mercury/Motor Guide Pro Team.