.... haven't read it in decade, or more. I bought it for many years as another paper backup for what I have in electronic form, and it sat on the shelf. But now we have that info on at least 6 devices, in formats that are interactive, graphic, on devices that know the time and place it is "now" and are quicker/easier to use underway. 5 contain their own batteries. Phones, tablets, CP, backup battery operated Garmin 476 CP. Sorry Eldridge, but its a new age.