We've added CAP/SAR Grids to our Chart viewer.
Choose the + in the upper right and Sectional or WAC with Grid.
You have to zoom in a bit before the grid starts showing. This includes both the Conventional(ORD-489) and Cell(40090CC) grid identifiers. Sorry, no Alaska yet.
If you are using OruxMaps or MOBAC, we don't yet have configuration files, but for the technically inclined, the new layers are 'secgrids' and 'wacgrids'.
Check: www.chartbundle.com/charts/ for more information as we progress.