This is a case of supermetaphor called metalepsis by Quintilian and transumptio by Geoffrey of Vinsauf. The images echo one another.

Fifty days later, more or less, the little turtlings hatch, dig their way up through the sand, and make a mad scramble to the sea.

A buttrice, and pincers, a hammer and nail, And apron, and scissars for head and for tail, Whole bridle and saddle, whitleather, and nall, With collars and harness, for thiller and all.

I prefer to use a map and a compass that is in my Jeep. I have made it to all of my clients on time using that method. I feel it would be like a calculator, I can no longer do large mathematical problems in my head due to lack of practice. I am afraid of what would happen if that was the case with GPS systems.