Slightly off topic, but some information worth sharing in this context.
On the g430/530 If you hold down the frequency flip button for a few seconds it will dial up 121.5
On the g650/750 (like the flash one in the picture) you can either push the volume knob in and hold it in for a few seconds, or if you have the remote flip button fitted, you can hold that down for a few seconds to dial up 121.5 .