Tides for iPhone

I have an old tide program on my Windows XP computer that's great. Has a ton of local and coastal locations and does both tide and current calculations and printable as well in graphs. Do you guys have any suggestions? I did a quick app search that produced nothing that stood out. Maybe non Apple app product that's web based?

My old program was great for pin pointing slack tides even upriver in the Portland and Oregon city areas. Always felt that the slack was when the bite would happen and planned my trips for at least 2 tide changes.