I was using sonar charts but the last files I uploaded came back that they could not be read by Navionics. I found that with the new 4.0 software Lowrance just released no longer includes depth in the GPX export. I ended up selling my Navionics card and have moved to Insight Genesis.
As far as Sonar Charts go if the lake/river has not been drawn in yet Navionics will draw it in using Google Earth and then add your data to it. At east that is what they advertise. I uploaded 2 lakes that did not exist. They were eventually drawn in but the contour lines were never added so basically I wasted my time. With Insight Genesis my data is drawn in the same day.
As far as Sonar Charts go if the lake/river has not been drawn in yet Navionics will draw it in using Google Earth and then add your data to it. At east that is what they advertise. I uploaded 2 lakes that did not exist. They were eventually drawn in but the contour lines were never added so basically I wasted my time. With Insight Genesis my data is drawn in the same day.
