Morse Code transmitter...?
Ermmm.... if you have a working iPhone, and network coverage, what use is a Morse Code transmitter?
Other than as a toy...?
Still it's about time books such as this embraced modern technology; I've long thought that electronic field guides would be very useful*, and allow flora and fauna to be identified with greater ease than with a book. Someguides are available like this, but they cost stupid amounts of money (e.g. £60 for the equivalent of a £6 book). And yet the 'printing and distribution cost' of electronic media is much less than for printed media.
* I even started writing one for my Psion, using its help system, about 15 years ago...
My Psion also had a Solar Compass. In fact, the Psion certainly led the way in 'Apps'. The most common extension for such things was indeed .app. On my Psion 5, the apps even come up with a grid of little icons, just like the iPhone/iTouch. The only thing it couldn't do (besides making phone calls...) was 'swish' through them.