The 5600 model line is probably the G-shock series with the most variations. I found it very confusing looking at the different models and wondering what are the differences in features. So out of curiosity (and sheer boredom ), I created the tables below. It helped me understand better, hopefully will help you too.

Obviously, the tables are not complete. I may miss some of the models through the history of 5600. I may miss some of the model / module info as well. Your comments and feedback are important to make this as complete and accurate as possible.

Notes and Legend:

1. Band 2 = Japan and U.S. atomic time radio towers
2. Band 5 = All but China atomic time radio towers
3. Band 6 = All current 6 atomic time radio towers
4. ST = Stopwatch
5. TR = Count Down Timer
6. AR = Auto Repeat
7. 5s CD = 5 seconds count down
8. Prog. Beep = Progress Beep
9. 30c / 29z = 30 Cities / 29 Time Zones
10. SS = Stainless Steel. Ti = Titanium
11. DT = Dual Time. Not to be confused with DST = Daylight Saving Time.
12. A "Yes" for "Current Time for Other Modes" meaning the watch is able to display current time in at least 1 other mode.
13. For rechargeable batteries, the "Life" is the duration the battery can last without further charging, after a Full Charge (FC).
14. All Count Down Timers are adjustable to minutes, unless note otherwise.
15. All G's are 200m WR, +/- 15s time accuracy, and able to switch between 12/24h time formats, unless note otherwise.
16. All the rest of the info should be pretty self explanatory, if not just ask.
17. Related models are ones using the same / similar modules, and/or simillar case to the 5600s, excluding non G models.
18. The G056 is excluded, because both its case and module are different from the 5600s.
19. Look up your models from Table 1A, 1B & 1C first, then look at Table 2 for module info.
20. Please refrain from quoting the entire table in your comment! Just provide the feedback, I will update the tables in Post 1. Looks better that way, thanks!

5600 Models and Features Master Tables: (Last Updated March 4, 2015)