In article , Cub Driver
wrote:

For systems intended for transport platforms where the environment is
fairly benign, ruggedized commercial or even pure commercial
may work.

According to the superlative "The March Up" (by Bing West), the
marines in Iraq actually preferred the commercial GPS units to the
military variety.

Not in that book, but probably on TV or in the WSJ, I recall that one
U.S. officer had his mother mail him a store-bought GPS unit.

I'll take a look at the book, Dan.
I was directing my comments at aircraft electronics though.
Handheld GPS isn't aviation. (not purposely anyway)

regards

--
Harry Andreas
Engineering raconteur