TABLE 6
Bit Allocation for a Specific MT51 to Authenticate a Subset of Ephemerides With a 128-bit Payload.
Metadata, etc
HMAC1
HMAC2
HMAC3
HMAC4
HMAC5
HMAC6
HMAC7
HMAC8
CRC
98
16
16
16
16
16
16
16
16
24