code: function getMinNorthing(zoneLetter) {
          var northing;
          switch (zoneLetter) {
              case 'C':
                  northing = 1100000.0;
                  break;
              case 'D':
                  northing = 2000000.0;
                  break;
              case 'E':
                  northing = 2800000.0;
                  break;
              case 'F':
                  northing = 3700000.0;
                  break;
              case 'G':
                  northing = 4600000.0;
                  break;
              case 'H':
                  northing = 5500000.0;
                  break;
              case 'J':
                  northing = 6400000.0;
                  break;
              case 'K':
                  northing = 7300000.0;
                  break;
              case 'L':
                  northing = 8200000.0;
                  break;
              case 'M':
                  northing = 9100000.0;
                  break;
              case 'N':
                  northing = 0.0;
                  break;
              case 'P':
                  northing = 800000.0;
                  break;
              case 'Q':
                  northing = 1700000.0;
                  break;
              case 'R':
                  northing = 2600000.0;
                  break;
              case 'S':
                  northing = 3500000.0;
                  break;
              case 'T':
                  northing = 4400000.0;
                  break;
              case 'U':
                  northing = 5300000.0;
                  break;
              case 'V':
                  northing = 6200000.0;
                  break;
              case 'W':
                  northing = 7000000.0;
                  break;
              case 'X':
                  northing = 7900000.0;
                  break;
              default:
                  northing = -1.0;
          }
          if (northing >= 0.0) {
              return northing;
          }
          else {
              throw ("Invalid zone letter: " + zoneLetter);
          }
  
      }
docs: The function getMinNorthing returns the minimum northing value of a MGRS
  zone.
  
  Ported from Geotrans' c Lattitude_Band_Value structure table.
  
  @private
  @param {char} zoneLetter The MGRS zone to get the min northing for.
  @return {number}