As a wild guess, are you pressing U (or whatever key you have for "Calibrate Mode") a second time AFTER you have:
1) Marked with the joystick and Y (or whatever you have for "Mark Point")
and
2) set the altitude - by clicking the clipboard map, on the target field
It is the second U that gets you out of calibration mode and turns the text green.
A small point, the green text does not mean "an accurate calibration has been carried out". It just means you have carried out the procedure.
I highly recommend going here
http://mysite.freeserve.com/mrbd/maps/bomber.htmFull marks and thanks to BenDover for this resource
For anyone who ever doubted the accuracy of the new AH Bombsite (like me), or who still needs a bit more practice (like me)
This link will take you to a very small download. It is a mini terrain.
Unzip it to your Aces High/terrain folder. You can practice offline, don't forget to choose the terrain within Aces High.
You take off at 12k and within half a sector there are loads of targets at sea level, including a fleet.
This means that you can cram a whole bomb run practice in to a few minutes. And the result is that you can get pretty accurate, VERY quickly 8^)
Hope this helps
DStar