I purchased a SE Asian package of Navionics charts but I can not speak for other parts
of the world. I found the Navionics charts around Indonesia
to be disappointing. Considerably less information displayed than the CM93 chart for the same area.
I am a Merchant Marine deck
officer. The ECDIS chart plotters I use aboard the ships are of the C-Map
variety. The CM93 charts look and feel the same as the high end charts used on an ECDIS. I am not clear of what the exact relationship is between C-Map and CM93 but to me, it's irrelevant.
I don't mean to diss Navionics charts. Many of the cruisers, maybe half of the ones I have spoken to, use Navionics charts and are happy with them. They are just not for me.
The chart plotter supplied with the Navionics charts I purchased does not provide a method of toggling on or off different displayed features. In fairness, this may be a function of the simplistic chart plotter rather than the Navionics charts. However, only a fraction of the information (when compared to CM93) is even displayed in the first place. Looking at one non commercial
bay in particular, the soundings and contour lines are grossly inaccurate on the Navionics charts, as if they were just made-up.
An interesting work-around with the Android-iPad-OpenCPN theory but I am afraid that would exceed my computer literacy.
The version of CM93 charts I have was last updated 1/1/2000 and I don't know of a more up-to-date source. Nor do I know of a way to update them. The offset in the Komodo region of Indonesia
is widely advertised in the cruising guides
and I think I may have been warned about the offset in Noonsight as well. I am not sure if the Navionics charts suffer this same error or not but a Google Earth
KAP file quickly illuminates the discrepancies.