Hi Josh, I also live and sail in Japan. Have been
boating for some time, but am not terribly experienced when it comes to sailing. Bought a (small but serviceable) sailboat some three years ago and keep it in a small
fishing harbor on the Uchibou coast in Chiba.
Incidentally, I have been reading the Cruisers Forum with interest since a while back, but this is my first post.
First of all, congratulations on passing the notoriously difficult Japanese boating
license test!
As for your question about charts, all three major
navigation apps for the iPhone/iPad, namely
iNavX,
Navionics, and iSailor have maps for Japan. I am using
iNavX (some $60 initial cost) and
Navionics (forget how much, but wasn't expensive I think), and for good measure I recently bought iSailor as well (2,200 yen for downloading the Japan charts). The way this works is you first install the app and then search/download the charts you need. Just give it a try. The apps all have their drawbacks and advantages in terms of usability, and it may be a matter of personal preference which one you end up using. iSailor seems to have the fewest features, but it's very easy to use (intuitive). The quality of the maps is also a bit of a tossup. They are all slightly different, but none of them when you drill down have the detail of the official Japanese paper charts such as available here:
Japan Nautical Chart Web Shop | Japan Hydrographic Association
The web site is a bit of a mess and hard to, ehem, navigate (the Japanese side is slightly better), but you can look around and order directly from them. The paper charts are not all that expensive and will surely serve you better than printouts from iPad apps (which will be not detailed enough if large scale or too numerous if small scale). The charts available from the above web site are in Japanese, but they all have some
English on them as well, and you should probably get some for your area. The same site also has electronic charts for maritime GPSes and such (very detailed and high quality, but expensive), and a chart program/map data for Windows PCs called, ehem, NewPec. I have that installed on a
laptop, and the charts are more detailed than the iPad apps (which for example don't provide information about stationary
fishing nets and such, which is quite important in Japan), but the NewPec
software is a horror to use and requires both an external
GPS and a copy-protection dongle to be plugged into the PC when you use it. And on top of that, it costs some 20 to 30 thousand yen, as I
recall.
I'd say at first go with some paper charts and one or two of the above iPad apps. But make sure your iPad is a 3G or 4G model, not the wi-fi only type, because that won't
work as a
GPS on the
water, unless you buy and
plug in a separate GPS thingie (such as Bad Elf). The
iPhone (any model) with the above apps is another option and okay for some quick orientation, but the
screen is too small for serious
navigation (easy to handle on a
small boat, though).
Anhow, I hope this gives you a bit of a
head start. Gambatte and have fun on the water! Japan is not the most pleasure-boat-friendly of countries but it does have some fine nooks and crannies in its coast line (at least until the next earthquake/tsunami hits...)
I'm off for a short
cruise tomorrow...