逆探知[gyakutanchi] phone trace
金属探知機[kinzokutanchiki] metal detector
金探し[kinsagashi] searching for gold
厳探[gentan] strict search
伺い探る[ukagaisaguru] to spy out

私立探偵[shiritsutantei] private detective
手探り[tesaguri] fumbling
人探し[hitosagashi] searching for someone
あら探し[arasagashi] finding fault
探し求める[sagashimotomeru] to search for

観測[kansoku] observation
観測ヘリコプター[kansokuherikoputaa] observation helicopter
計測[keisoku] measurement
再測量[saisokuryou] resurvey
三角測量[sankakusokuryou] triangulation

実測[jissoku] survey
実測図[jissokuzu] measured map
写真測量[shashinsokuryou] photographic surveying
推測[suisoku] guess
測候所[sokkoujo] weather measurement station