Heart rate monitors

So, I now have a heart rate monitor with my Garmin. I think I calculated my maximum heart rate correctly at 179. So, is the goal to keep my heart rate at 80 - 90% of maximum when running? I keep researching it and find all kinds of stuff. During my run tonight, it seemed to stay around 149, which would be 83%.

Or, do I have this thing all wrong. At this point, I really don't see how using it will benefit me, especially if I don't get it! :)

Any heart rate monitor fans out there?

You got it right. It helps to keep your cardio in the proper range so you get the maximum benefit out of your workout.

it really depends.  for different training/races you will want to target your HR for particual zones.  best bet would be to get your zones mapped out (at the gym or some facility that can do the testing).  once you have your zone ranges established you can then try to train in certain zones for specific events or training sessions.  i.e., for a long slow run/half/full marathon, you would want to be in zone 2 or low zone 3.  for a 5k, high zone 4 or greater (if you have the stomach for pain :) ).  there are a million ways to slice and dice it.  For me, my max is also around 179, 149 is mid to high zone 3 for me, but it may be different for you.  Hope this helps and doesn't just make it more confusing.

 like you I really don't know a lot and have been researching, but I have been working with a coach that tells me exactly where to keep my HR for each activity.. I am pretty sure there is a method to her madness, but I really don't know if I totally understand the methodoogy :)