A nib file is 232960 bytes long = 6656 bytes per track.
TRACK OFFSET (HEX) OFFSET (DECIMAL) $00 $0 0 $01 $1a00 6656 $02 $3400 13312 $03 $4e00 19968 $04 $6800 26624 $05 $8200 33280 $06 $9c00 39936 $07 $b600 46592 $08 $d000 53248 $09 $ea00 59904 $0a $10400 66560 $0b $11e00 73216 $0c $13800 79872 $0d $15200 86528 $0e $16c00 93184 $0f $18600 99840 $10 $1a000 106496 $11 $1ba00 113152 $12 $1d400 119808 $13 $1ee00 126464 $14 $20800 133120 $15 $22200 139776 $16 $23c00 146432 $17 $25600 153088 $18 $27000 159744 $19 $28a00 166400 $1a $2a400 173056 $1b $2be00 179712 $1c $2d800 186368 $1d $2f200 193024 $1e $30c00 199680 $1f $32600 206336 $20 $34000 212992 $21 $35a00 219648 $22 $37400 226304