Velocity Made Good (VMG) on a tablet?

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I use Navionics on Android devices as my main navigation. I love it and it has saved over $1000 on overpriced marine nav displays. But the one thing I'm lacking is a convenient way to calculate VMG (without having to do it constantly in my head).

Note there are two kinds of VMG people typically talk about - VMG to waypoint, and VMG to windward (wind angle). VMG to windward is simply wind angle + speed over water. (note: apparently there's some debate over acronyms: I don't care to discuss that, so will just state in words what I mean)

VMG to waypoint (GPS-based) seems more useful. We often sail in current, and GPS-based VMG would make it very clear which side of a channel has better current, which tack is favored, etc.

VMG to waypoint is simply angle to waypoint + SOG (gps speed). Navionics has that info, so it's surprising they haven't implemented VMG. Is there a different Android app I can do it with?