Heart Rate Monitor Questions..

No****erproof....like I shouldn't wear it if I went running in the rain or I shouldn't submerge it in water..

I think that's my big thing....I want to be able to run in the rain..

Yeah don't jump into the ocean wearing it.

You aren't going to be using it for the swim portion of the triathlon.

But I should be good to go running in the rain with it?  That's my only real concern..

Are you planning to run in a hurricane?

Other than that you should be fine.

IPX1 means that an item is not really protected agains****er. IPX8 means that you can safely take the item underwater — although the depth and time that it is safe underwater can vary. A lot of ‘waterproof’ electronics are IPX7, which means that they will be OK if you accidentally drop them in a stream and get them out immediately.

The watch is rated at IPX7
See below for full stats.

Physical & Performance:
Unit dimensions, WxHxD:	2.1" x 2.7" x 0.7" (5.33 x 6.86 x 1.78 cm)
Display size, WxH:	1.3" x 0.8" (3.3 x 2.0 cm)
Display resolution, WxH:	160 x 100 pixels
Touchscreen:	no
Weight:	2.72 oz (77 g)
Battery:	rechargeable lithium-ion
Battery life:	10 hours, typical
Water resistant:	yes (IPX7)
GPS-enabled:	yes
High-sensitivity receiver:	yes

Maps & Memory:
Basemap:	no
Ability to add maps:	no
Accepts data cards:	no
Lap history:	1000 laps
Waypoints/favorites/locations:	100
Routes:	50

Features:
Heart rate monitor:	yes
Bike speed/cadence sensor:	yes (some versions)
Foot pod:	yes (optional)
Automatic sync (automatically transfers data to your computer):	no
Garmin Connect™ compatible (online community where you analyze, categorize and share data):	yes
Garmin Training Center® software compatible:	yes
Virtual Partner® (train against a digital person):	yes
Courses (compete against previous activities):	yes
Auto Pause® (pauses and resumes timer based on speed):	yes
Auto Lap® (automatically starts a new lap):	yes
Auto Scroll (cycles through data pages during workout):	yes
Multi-sport (changes sport mode with a press of a button):	yes
Advanced workouts (create custom, goal-oriented workouts):	yes
Simple workouts (input time, distance and calorie goals):	yes
Pace alert (triggers alarm if you vary from preset pace):	yes
Time/distance alert (triggers alarm when you reach goal):	yes
Vibration alert: (choose between alert tones and/or vibration alert):	no
Interval training (set up exercise and rest intervals):	yes
Heart rate-based calorie computation:	no
Customizable screen(s):	yes
Barometric altimeter:	no
Unit-to-unit transfer (shares data wirelessly with similar units):	no
Power meter compatible (displays power data from compatible 3rd party ANT+™-enabled power meters):	no
Temperature (displays and records temperature while you ride):	no
Spor****ch:	no

 I have the 405 and the 305.  Wearing the 305 is like wearing a brick on your wrist, the 405 is smaller and has a better form factor.  I have the 305 on the bike (it has a larger led so it actually is better for that).  I did a run in the rain no problem.  I also have the heart monitor with it, but it annoys the heck out of me (wear it around the chest).  Not sure Heart rate training is for me, I basically have two speeds:  go and stop.  

I am gonna take a chance here that someone will answer my questions since this is an older post.

I am working into my 3rd 1/2 marathon, but I would like to be able to run most if not all of it. Needless to say, I am very new to running-so I am not sure of all the lingo. My last 1/2 marathon I noticed a lot of people wearing watches that would beep and they would stop running...it would beep again and they would start running again. I would really like something like that. Is that what is referred to as the pacing?

I am really bad a waiting-so in the mean time I am going to repost this as a new post, but I am hoping someone can help me out!

Thanks!

I use the HRM to calculate calories burned and RPE for training.