Current direction and slack-water countdown for sea kayak training

Shows tidal flow direction, speed, and minutes to slack water so I can time interval pieces against the current. Combines tide tables with my GPS heading. It's niche, but if you train on moving water you'll get it. Survives spray and glances at the 600x600 size.
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The slack-water countdown is the bit I'd have killed for on flat days, timing intervals against the flow instead of guessing. Does the flow direction follow your GPS heading or stay true-north so 'with current' actually means with your boat?