I am pleased to inform that MoonCalc is now Built For Blackberry approved.
This means that it has been positively verified for full compliance with all BlackBerry criteria when it comes to UI design, power and resource efficiency, user expierience, code quality, security, etc. It is the only Moon tracking tool for BB10 with the BFB designation.
Additionally, the most recent version includes True North / Magnetic North selection for compass. If True North is selected, local magnetic variation (declination) is obtained and added to compass readings, which makes it point to the geographic North (and thus also to Astronomic North as the tiny difference between them is negligible).
MoonCalc is available in the BlackBerry World