I tried interchanging between the hotmaps Canada card and Navionics 648 Platinum Plus, and also tried it with both cards instered at the same time and had the unit auto select. I dont think I 'analyzed' the view with both cards removed but I believe I had the unit on when I was removing and switching cards and at no time saw any water on the chart at my location despite being on the body of water at the time. Its a reasonably large and well used (many boaters and cottages and within 75 minutes of the Capital of Canada) so I find it very unusual that it would not be included . I have visited the lake 3 times this summer and its the only lake/river that is showing up as land. I find this puzzling
If I go to the lake again I wil be sure to try it without any cards instered however I am skeptical it will make a difference since I have found that with other bodies of water I see a shoreline whether or not I have the appropriate Navionaic card inserted.
Thanks for the insights. I do plan to upgrade my firmware/software anyhow, but currently and doing fine otherwise with my year old update and I figure why mess with satisfaction unless I have a good reason.
. I was looking for a good reason