Re: iPad users only
I'm not in my 50s, but I use my iPad 1 for navigation too. Remember you need the 3G version (cell version) to have the GPS. I use and recommend BOTH iNavX and Garmin's BlueChart because I like having both raster and vector charts. I'll use ActiveCaptain for planning, but I find if I try to use it when actually underway I get crashes.
At the risk of being keel-hauled, I also use it as my electronic log, maintenance log, punch list, and it carries ALL of my navigation pubs (available as PDFs from NOAA, so I have the Light List, List of Lights, Bowditch, Coast Pilots, etc on there as well - probably about 50-75 lbs worth of books) and technical pubs (engine manual, etc). The PDF Viewer app was a free download, and does a really good job. Everything backs up to my computer.
The backup to this is my iPhone. Whatever works on my iPad also works on my iPhone. Tertiary goes to a handheld GPS, then finally I'm on to my charts. And I carry a computer on real passages.
I have also used this system underway during my day job on big ships. I like to be able to perform an early crosscheck of our electronic navigation system. Trust but verify.
1981 O H Rodgers 33
"The cure for anything is salt water - sweat, tears or the sea."
- Isak Dinesen