Chains without any nylon straps is a bad idea. Chains do not stretch at all and can shock load the fasteners holding the attach tracks to the floor. Chains should be used to attach the nylon straps to a steel loop attached to the machine, but nylon straps need to be used thereafter.
Boats and ships have entirely different criteria and working restraints and should not be compared.
Also, all 44 to 50 straps used to secure the machine, need to be attached at least 20 inches apart on the floor tracks, so as not to overload the floor tracks at one point.
These special loads are for professionals to deal with, not your average rampy.