I train endurance race horses and use my garmin to record/track workouts as well as during races to check distance and pace. I have a 205 but have to replace it because it has started shutting off after one hour (I think due to battery drain or maybe because it wasn't as water-resistance as I needed). I can't tell from product descriptions if the water proof 405 will allow me to switch it off of run or biking to horseback, not that it's a huge deal but I'm kind of OCD about those details when I'm keeping records. Can anyone tell me if I can switch to that activity on the 405 or should I be looking at other models? Important to me is battery life, durability, and water resistance.

Tech Specs:

Material:

plastic, rubber 

Dimensions:

1.88 x 2.78 x 0.65 in 

Antenna:

internal 

Routes:

0 

Waypoints:

100 

Mapping:

no 

Digital Compass:

no 

Waterproof:

no, water resistant 

Battery Type:

rechargeable lilthium ion 

Battery Life:

(power save mode) 2 weeks, (training mode) 8 hours 

Expansion Card:

no 

Weight:

2.1 oz 

Recommended Use:

training, running