Garmin 405 during Races

I've raced with my 405 a number of times.  

I OWS with it, putting it into my bathing cap.  But, that's purely for swimming- so I know how far/long I went.  I don't use it for race day in the water.

Instead- leave it strapped onto your bike.  Set up a cycling screen- one that gives you speed in mph, distance, hr, time- whatever fields you want.  Then set up another screen for running- giving your HR, Pace, etc.

There are a few tricks.  The first is how you're going to start it when you get to T1.  Some turn the 'auto-off' part "off" and use the autopause feature- so it just sits there and waits, and then starts automatically when you start moving your bike.  Me- I don't like to use autopause during a race, as then the times don't match.  

So, I just hit the button when I arrive at T1, and by the time I've got my helmet and shoes on, it's ready to go.  I'll start it at bike mount for timing my ride (you don't get your T1 time tho'). 

the tricky part is moving it from your bike to your wrist, before the end of the ride.  might want to practice this.

hitting the lap button as you enter end exit transition will give you your T2 time and your bike/run splits.  

it works.