From: usenet@listmail.good-stuff.co.uk 
  
 On 11 Aug 2025 20:42:42 GMT, Roger Hayter  wrote: 
  
 > 
 >Or in SI notation 82m AOD. I really don't like the hybrid of a unit and an 
 >acronym, even if the water companies do. 
  
 It's always been the norm in hydrography, mainly because it avoids any 
 possible confusion caused by someone expressing a value but omitting the 
 datum. 
  
 Mark 
  
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