1 - AFAIK, the latest release of CM93 v2 was July 2012 (e.g. #1). None of the branded 2013 releases I've tried were younger.
2 - If you're satisfied with the Navionics
coverage (test it at https://webapp.navionics.com/?lang=en
(and you insist on using O), you can use SASPlanet (+ SASplus maps folder) to download Navionics
mbtiles, even for of a large area, that SASplanet can later transform into kap tiles that O can read (e.g. about 12 hours for downloading the Irish coasts at z17 and z14 levels and converting to kap) (#2,3,4). Drawback is that you have to repeat the procedure every sailing season.
The same procedure will obviously get you Google
, Bing, Nokia...(you name it) sat coverage, very useful in backwater areas...
3 - If you're not satisfied with the Navionics coverage, but desperately want up to date worldwide charts
on your computer, you will have to look beyond O. I am satisfied with TelChart V3 3.5.32 (clunky interface !) and CM93 V3 (latest release 'available' today is #840 = 2017 week 40 =
October 2 - 8, 2017, a 3 Go download as compared with 1,4 Go for V2) (#5, 6, 7, 8). Tested on W7 and W 8.1 (hint: run all required .exe as admin)