Re: basic nav electronics
guess i don't understand the question.... ya want nav electronics. a stereo and a vhf don't help ya navigate. charts are a great idea. if ya know what they mean. the more i think about it, charts would be impairitive. as to navigate is to know where ya are and go from here to there safely... a compass will help ya navigate. gps too. don't forget radar too. it's also a navigation tool. fish finder and depth gage are basicly both sonar. it can help navigate along with yer charts, as they have depth contours and that can help pin point ya. for safety, a vhf can interface with a gps. it's called dsc. digital seletive calling i believe. if the vhf radios distress button is used. a mayday goes out along with your gps corridinates.
so where ya boatin at? this will help dictate what kinds of navigation equipment ya'll need along with what kind of safety items to have on board... there is a lot more to navigation than just haveing the correct electronics.... though that's a good start
of yer list.
1gps, nav
2sonar (covers your item 2 & 4), nav and safefty
3vhf, safety
4stereo, toy