Does the chart say uncompensated baro vnav? Pretty sure that means all of the information in the chart is based on uncompensated, with the NA above/below temperatures built into the obstacle clearance areas and the DA/MDA...
From what I remember, if the chart says uncompensated, you fly uncompensated...
If you want to compensate, you must inform ATC and seek permission. It is usually no, as the means and methods of compensation are varied, and most dont understand where and when to add. The compensation factors can lead to loss of separation if applied randomly. This can happen by a number of factors, as some ac have a compensation feature, while others do not...