First off Hello! Very nice to have a helpful site as this.

I need to prove compliance to get my physical card to be legal to drive a truck again. How is this done? I sometimes take the mask off while asleep, will this trigger something in the data and tell on me? I have been forced to be off work for 1 month till I am reviewed, I am very worried, I have a family to support and my Fiancee is disabled so I am the main income for our family. If I have it powered on and I accidentally take the mask off or it leaks what will happen?

I am no expert but have been on CPAP since 2002 and I can tell you that when I first started CPAP I had taken off the mask in my sleep in the beginning. Alot of people do. In fact it is always an issue for newbies. Did you read the WIKI at the top of the page, the one with the light bulb? They say that is where newbie should start because there is alot of info about CPAP and you just might find some answers there?

Just recently a newbie had the same problem:
viewtopic/t52379/MY-FIRST-PROBLEMTAKING-THE-MASK-OFF.html

and yet another person with the same issues?
viewtopic/t52396/I-am-a-WORTHLESS-OSA-patient.html

I understand compliance is defined as >4 hrs per night for 70% of nights.

Leaks will switch the machine off in many cases. If your machine has a leak alarm, switch it on so you can re-fit the mask.

Rather than focussing just on the "bare minimum" compliance, how about taking it seriously and doing it properly? The you won't need to worry.

CPAP Therapy will improve your life. Stick with it.

I seriously doubt that the "standard" acceptable compliance of 4 or more hours per night, 5 or more nights a week will suffice for professional drivers. You might want to check w/truckerdad at apneasupport.com

If you read the suggested threads, there are all sorts of tricks to wake you when you remove the mask. But the bottom line is that you are probably removing the mask in the middle of the night either because it's uncomfortable or it is leaking when your pressures go up, or both.

Talk to your sleep lab and ask for help in making sure that you have the most comfortable mask for your face and sleeping style and that it is adjusted so it doesn't begin leaking when the pressure increases (the mask needs to be adjusted with the pressure up and you lying in your normal sleeping position).

Don't delay--if you need a different mask, generally you can return the mask you have only within a 30 day window. Your time to meet the compliance deadline is probably also running out. This takes some work and attention to get your therapy optimized so you can safely go out on the road again. It's vitally important to get this right--you have an enormous responsibility when driving a rig, and optimizing your treatment is part of that responsibility.