Would anyone please explain the following. If I am taking readings daily of the local weather, should I set the barometer to Relative - which is the sea level setting - or Absolute, which is the reading from the station itself? There seems to be quite a difference. Eg when I check Farnborough TAFs and METARs they are obviously using QNH which is sea level and not QNH field elevation. I may, of course, be wrong. Any ideas chaps and chapesses? Regards Andy