Detailed mapping for New Melones lake, the 5th largest man-made
reservoir in California, isn't available for any GPS/ fishfinder units
that I can find. Anyone have a clue why? All the other big bass
reservoirs in Ca are mapped with detail and New Melones has
tournaments pretty much year round. The original dam was built in
1926, then a larger dam was built starting in 1966. Could this be the
reason? Could the fact that it's a (water) airport have anything to do
with it?

I've read that Navionics does some of their own mapping. Is this true?
Does requesting a new lake be added to existing products via their web
site work? Tried to sort all this out using google with no luck.
Appreciate any info offered.

-phish