1) искатель
2) визир, визирное устройство ( киноаппарата ) ; видоискатель ( фотоаппарата, телекамеры )
3) пеленгатор; устройство обнаружения
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- acoustic depth finder
- airborne radio direction finder
- angle finder
- aural-null direction finder
- automatic direction finder
- automatic range finder
- automatically tuned direction finder
- beam splitting reflex finder
- bearing finder
- brilliant reflex finder
- cable finder
- camera view finder
- celestial direction finder
- coincidence range finder
- depth finder
- direct vision finder
- direction finder
- Doppler direction finder
- echo depth finder
- edge finder
- elevation finder
- eye-level view finder
- fault finder
- frame view finder
- ground-glass view finder
- height finder
- impulse direction finder
- lightning direction finder
- line finder
- list finder
- location finder
- loop direction finder
- pentaprism view finder
- pick finder
- position finder
- prism view finder
- radio direction finder
- range finder
- reflex view finder
- sense finder
- sonic depth finder
- static direction finder
- supersonic depth finder
- view finder
- waist-level view finder