If you really want a visible grid and not just a way of checking coordinates, an easy way to cheat is to make a GPX file with tracks where you want the grid lines. I did that for reports for our county's Breeding Bird Atlas, where reports were by grid square so you need to be able to see the grid when you're out on a trail. If you think that sounds useful but want help creating the GPX, let me know.
A better way would be to make an overlay/underlay map with grid lines on it, so you could adjust the transparency of the grid lines in OsmAnd. But that's a lot harder. There's probably some way to make the grid image in QGIS, but I couldn't tell you how; then it's a several-step process to turn the image into tiles you can use in OsmAnd.
...Akkana
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