I like the flat whistle sold by TOPS but if you watch you can find the exact same type of Coast Guard $5.99 whistles for a $1.00 at dive shops or even on peg board displays but you must watch and know what you are looking at.
Don't laugh to much at the Brunton Kit, your right its not but the compass does work and the cards can sometimes remind you of things you already know but have forgotten due to the stress of the moment.