Fishfinder/GPS question?????

[Mac_Attack]

Here is the little bit I know about Map create. *Its a program you load on your computer and create an area map that you will frequently use. *This info is then downloaded onto one of five memory chips to be placed into you FF/GPS unit. *I was wondering how good is the nautical information. *I had read on Thehulltruth that it was more of a land map program. *Bill Mc *;D