"No one looking for you monitors FRS/GRMS"

True, unless, You state on your leave behind at home note something like

" I have a grms radio (charged) and will be listening/transmitting on #x chanel at the first and last five minutes of each hour."

Then SAR might stop by at Target and buy a set of radios just to look for you....

Teacher

(My reading on these radios shows between .5 miles ( ~1km) in dense woods up to 18 miles reception under perfect conditions. But even so, a 1 km radius is a big spot.)