Section 6: BIT-MAP SECTION
| Octets | Key | Type | Content |
| 1-4 | section6Length | unsigned | Length of section in octets (nn) |
| 5 | numberOfSection | unsigned | Number of section (6) |
| 6 | bitMapIndicator | codetable | Bit-map indicator (see Code Table 6.0 and Note 1) |
| 7-nn | Bit-map - Contiguous bits with a bit to data point correspondence, ordered as defined in Section 3. A bit set equal to 1 implies the presence of a data value at the corresponding data point, whereas a value of 0 implies the absence of such a value. |
( 1) If octet 6 is not zero, the length of the Section is 6 and octets 7-nn are not present.