[GPSNavX]

GPSNavX and MacENC do allow you to step through your recorded track. Enable the track to be displayed with the "Show" menu item on the "Track" menu. Select any track record in the Track window and then use the arrow key to scroll through the list. If you have a chart open with the track position you will see a gray ghost position icon move along as you arrow key down or up in the track history. While not a "play" button it does allow one to replay their days sailing at a speed much greater than real-time.

One can also [command] [click] anywhere along the track plot on the chart and that will select the closest track record in the Track window.