The compass feature requires frequent calibration. The altimeter feature also requires daily calibration. I am very disappointed in this product and would not purchase it again if I had the choice.

After reading other customer reviews I opted not to purchase the Altitech-2. Then I decided to give it a try and send it back if it didn't work. Mine has worked well--barometer, thermometer--everything! Glad I got it, especially at $97!

Unfortunately we had to have a replacement sent. Hopefully the first one was just a dud. The clip and the altimeter unit seperated from one another at a very unopportune time - we lost the altimeter entirely and later realized it was gone... all too late. We're going to try again. Amazon was very gracious and helpful in sending us another at no cost.... When we had it it worked wonderfully! Just be sure to reset it or coordinate it or whatever each day for optimal perfomance.

after reading many reviews from various sources I wanted to try the altitech for myself I have always wanted the all in one watch altimeter compass but always thought no way I want something that big on my wrist
so when I saw the carabiner version that I can clip to A belt loop I knew this is the one for me

first the build quality is very good and should last in the real world just fine the display is big and easy to read and the night light rocks

I ran through the callabration as stated in manual and then compared with
other devices I already have to compare readings

1 the compass is right on with my anolog compass as long as I am outside inside the car forget it. many have stated that the time out in compass mode is to short just hold the start/lap button and the compass will stay on as long as you want.

2 the temperature was right on with a HVAC IR thermometer that I have when I pointed the IR detector at the therma sensor on the altitech.

3 I set the barometer to the local tv station report which is in inches
to convert to mbar multiply inches X 33.864 = mbar after doing this I went to the altimeter function and got a elevation reading in the ballpark with the reading I get from my GPS I say ballpark because elevation is the least accurate reading on any GPS and will tend to drift but the avarage reading on the GPS was close to the altitech reading which is a steady reading and one I think I would trust more

4 time date alarm chrono timer yea does that to, time will tell how well it keeps time seems fine to me. the alarm is not loud and will not wake you up from A sound sleep unless you duck tape the altitech to your ear
think more of a reminder chirp but who needs a alarm in the great outdoors anyways

I bought this watch a couple years ago and I'm still very happy with it. I do not like wearing wrist watches, so the clip is ideal. As for the various functions (compass, temperature, altitude, etc.), they have all worked great. The temperature readings are correct if you place the watch away from your body heat and give it enough time to equilibrate. The compass works well too for quick readings (and you can regain compass mode as many times as you like if the display is not long enough for you). Like any multiple-function watches, it has issues, but compared to the Suunto watches that I have owned, this one is a much better value for the price.