I have the STORM Whistle on my lanyard. It's bulky, but I want to be HEARD! Don't forget to make some manner of protective sleeve for your mirror. It doesn't take a lot of abuse to scratch them. Exploration Products carries the USCG approved flat whistle @ 1.50 ea. They just increased basic shipping to 7.50. So unless they send you the blue introductory order sheet with free shipping buy some gear! www.epcamps.com. I also carry an Aussie 'bullroarer'. This is a small teardrop shaped piece of wood on a string. It makes a LOUD whirring noise that carries for miles. If you saw Crocodile DundeeII one is shown in use.Do a simple search for Bullroarer. There are a handfull of shops in AUS and Ca that sell fancy versions.<br><br>