http://www2.casio.co.jp/manual_pdf/wat/en/pdf_search.php?MODULE=1174&submit.x=46&submit.y=8
A person can find objective reviews for the Casio Frogman watch online. Some websites that have these reviews include Watch Report and Casio Frogman Reviews.
Download for free from Casio's web site. One caveat: Casio lists the manual by watch modules instead of watch model number. You can usually find the module number stamped on the back of your watch.
The best place to buy a Casio GPS watch is on the official Casio site. You can find them in all sizes and styles, as well as get future discounts and promotional codes via email after ordering.
I went to the following review site: http://reviews.cnet.com/smartphones/casio-g-zone-commando/4505-6452_7-34660420.html where you can watch a video about the casio G'zOne Commando and also review it with other like phones.
Department stores offer digital watches for sale. One may be able to find the Casio PAGG80 1V there. Online stores will sell this watch as well. One may purchase it second-hand from websites such as Amazon or eBay. The official Casio online store also stocks watches.
Casio chords is an option on Casio keyboards that lets you play chords by pressing a single key.
In order to find out if this watch is safe to wear during your exercise routine I would suggest either reading the customer reviews, actually wearing the watch once or twice to find out, or checking the safety information on the box.
One can find detailed information about Casio musical instruments from the manufacturer official site. One can also find information from Amazon as it offers Casio musical instruments.
Londoners can find information on Casio cameras on cameras.co.uk, which has reviews and a list of stores which carry them. Casio has a UK version of their website as well.
eBay
The G-Shock website has a store locator which can find local authorized dealers where the watches can be purchased. These dealers sometimes also offer services for performing maintenance on the watch, such as changing the watch battery. G-Shock watches can also be purchased from merchant websites such as Amazon and eBay.
Reviews for Casio wristwatches and many others can be found at Amazon reviews, Yahoo reviews, or the Watch Report online. One could also check the local library for back issues of Consumer Reports magazine, or the official Consumer Reports web-site.