/usr/share/map_msgs/msg/OccupancyGridUpdate.msg is in libmap-msgs-dev 1.13.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | Header header
int32 x
int32 y
uint32 width
uint32 height
int8[] data
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