>Gears and Wears>Setting Max HR
When I first setup my Garmin watch, it set my Max HR to 185 after asking my age and gender.
Well, last night while doing some hill repeats I maxed out at 195 (with most of the repeats hitting over 190).
Does this mean that I should update that setting to 195? I am starting to pay a little some attention to heart rate zones in my training so I want it to be reasonably accurate.
So long as you think it was accurate and repeatable, yes. Personally I'd add 2 or 3 too.
Do what you want, just how you like. Nobody has to know.
If you want it to be accurate, do not use a formula. You need to conduct a field test to determine your zones.
From my understanding, Max HR is not the most effective metric to use for determining training zones. You are better off using Lactate Threshold.
Here are some resources on how to do a field test for LT:
Yes, your Garmin is incorrect.
Best way is to measure it in a race as you sprint the last half mile or so.
Log PRs Crusted Salt comics #192 (NSFW)