Altimeter full real.

[322Sqn_Dusty]

For the full real pilots:

Let's assume this: the dynamic weather works. Air pressure changes while clouds are forming over the channel and we're waiting for a gap in the overcast.
For the mission we've set our compasses and aligned the gyro.

But we've also got the altimeter that can be set to the pressure, where can we find the right settings for the field or must we just zero it before take off? And do we bother at all?