What Does the F Mean on the Lowrance CMAP?

[adventurejack]

I have noticed that some of the Lowrance Cmaps have an "F". And others with the same name omits the "F" I am wanting to purchase one but I am not sure which one is the most up to date version. I have found that some stores are offering the one with the F at a lower price. Anyone have a clue. I looked on Lowrances website and left messages but no response.Lowrance C-MAP Precision Contour HD F/Tennessee [M-NA-Y901-MS]

[adventurejack]

UPDATE....Well....after much communicating with as many places as I can, there was only one place (Anchor Express) that had an answer... the "F" in F/TENNESSEE stands for "for". LOL Don't know if they were making that up or not but I'm gonna take that as a good answer.