Here is another big tip that could save you a lot of angst:
If you travel a long way between sessions, say, more than 50-100km's, your GPS may take some time to get a proper fix.
Its a very good idea to turn on you GPS and let it sit outside for at least 15 mins to allow it to get a good fix and aquire all the satellite location data it needs. Do this before you go out for your session. Once you have allowed it to find it's location it will be fine until you move some distance again.
For example, when we got to Luderitz last year, we put our GPS on the balcony the first morning. It took some of them well over 15 minutes to get a good fix. If you had not done this before your session, you may find you have lost the first past of your session. Too bad if you did a PB! :-(
This happened to me at Lake George a couple of years ago. I had 3 GT-31's. Two in my helmet and one on my arm to view. I turned them on and cleared them and then put the two in the helmet. The helmet was sitting on the seat in my van until I went out. The other was on my arm getting a fix outside as I finised rigging. In this session I set what would have been a world record 1 Hour, but afterwards I found the two GPS in the helmet had missed the first 10-15 mins of the session due to not haveing got a fix yet. You can imagine my disappointment.... :-(
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