BEGIN WITH A FLOATING LINE
As mentioned, tarn trout tend to cruise over shallower areas when feeding. A fast sinking line will snag the bottom quickly now. This, and the fact that upland trout are highly dependent on terrestrials dropping in from above, means a floating line should be our first choice. So, can you fish traditional wet flies on a sinking line? Really blustery weather can instantly blow your floating line around at the surface. Faced with such conditions the shrewd tarn angler will switch to an intermediate, or slow sinking line. Not only do you have more direct contact with your flies, but being slimmer in diameter than floating lines and of course that bit denser, sinking lines penetrate niggling winds more easily. Tradition might have it that a team of wets should ideally be presented on a floating line, but the very same flies can just be lethal when fished a tad deeper.
A reel loaded with a floating line should be your first choice.