Check out the convoy routes on the pull-down map at the top left of the navmap screen. It'll show you convoy routes for various dates. Loitering around routes, in particular convergence points, is good.
Check out SH3Gen, (just search SH3Gen in forum), it's a good add-on that gives you intel, configurable as to how reliable you want it.
In terms of actual tactics, I run pretty tight patrol tracks up and down my hunting areas, submerge a lot, or for long periods, and listen every hour or so (myself vs sonarman, who is generally useless ... but see also thread in mod forum re visual and hydrophone mod, I haven't installed it yet, but will)
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