My First G-Shock is a GW-6900
This article is a transcript of a video that you can watch by clicking the thumbnail below. Hence, certain statements may not make sense in this text form, and watching the video instead is recommended.
Transcript
The DW-290 is almost perfect, but when you upgrade from a DW watch to a GW watch, you gain a few super-powers. You may not need it for regular time-keeping, but that is where this GW-6900 comes in.
It gets solar charging and multi-band radio reception, turning this thing into an atomic watch for precise time tracking, world time feature, and increases the number of alarms to five.
There’s also an additional feature where the EL backlight now comes up every time you turn the watch towards you to check the time when you’re in a dark area. There is some aftermarket mod support for this watch, unlike none for the DW-290, although if you look on the web, there are more mods for the DW-6900 than this GW-6900.
But then the GW-6900 adds much more like, these meaningful graphs show statuses unlike those on the DW-6900 that merely counted seconds, and the power-saving feature that is a thing with solar-powered Casio watches.
Also, compared with the DW-290, this screen can display a little more text, like this full year while setting time and the letters of the day of the week in the time-keeping mode.