Notes
How to mount a partition from a full binary image with an offset
$ sudo fdisk -lu sda.img
...
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
...
Device Boot Start End Blocks Id System
sda.img1 * 56 6400000 3199972+ c W95 FAT32 (LBA)
$ mount -o loop,offset=$((56 * 512)) sda.img /mnt