MGH_TF_LATITUDE Name
  
   MGH_TF_LATITUDE Purpose
  
   This function is designed for use with the TICKFORMAT property of IDLgrAxis.
      It adds 'S' and 'N' suffices appropriately.
Category
      Miscellaneous 
  
   Object graphics Calling Sequence
  
   Result = MGH_TF_LATITUDE(Direction, Index, Value)
Inputs
  
   Direction:  Axis direction, required by the TICKFORMAT interface but ignored.
  
   Index:      Axis index, required by the TICKFORMAT interface but ignored.
      Value:      The real value to be formatted.
Keyword Parameters
  
   DATA (input, scalar structure): 
    
     Specify this keyword to control the output. The value should be
          a structure with one or more of the tags "format" and
    
     "round". The default is equivalent to {format: '', round: 0}.
Return Value
  
   The function returns a scalar string representing the input 
  
   value. If data.round is set to a 'true' value then this is 
  
   rounded.  The format is controlled by data.format. If this is not
      supplied a default format is generated by FORMAT_AXIS_VALUES.
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    This software is provided subject to the following conditions:
    1.  NIWA makes no representations or warranties regarding the
    
     accuracy of the software, the use to which the software may
    
     be put or the results to be obtained from the use of the
    
     software.  Accordingly NIWA accepts no liability for any loss
    
     or damage (whether direct of indirect) incurred by any person
          through the use of or reliance on the software.
    2.  NIWA is to be acknowledged as the original author of the
    
     software where the software is used or presented in any form. 
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Modification History
  
   Mark Hadfield, Jun 1998: 
          Written. 
  
   Mark Hadfield, Feb 2000: 
    
     Added format control via the DATA keyword. 
  
   Mark Hadfield, May 2001: 
    
     Added rounding via the "round" tag in DATA. I might generalise
          this some day. 
  
   Mark Hadfield, 2002-10: 
    
     Added rounding via the "round" tag in DATA. I might generalise
          this some day.