BG,
If you are "blind" fishing, and if you are interested in ALL the water column to that depth (and beyond), it may be to your advantage to set up a shooting head system. Merely add one spool to your reel, a shooting line to which you attatch differing density shooting heads of the same weight for covering differnt areas of the water column at differing speeds, if you wish.
A head system is very easy to learn to cast.....all the same basic casting principles apply. A head system is very versitile and handy....carry it all in your vest. A head system is grand for tossing at night.
......lee s.