Hey, I am wrong again.. Looking at Appendix A, Part 43, Preventive Maintenance:

 

(32) Updating self-contained, front instrument panel-mounted Air Traffic Control (ATC) navigational software data bases (excluding those of automatic flight control systems, transponders, and microwave frequency distance measuring equipment (DME)) provided no disassembly of the unit is required and pertinent instructions are provided. Prior to the unit's intended use, an operational check must be performed in accordance with applicable sections of part 91 of this chapter.

OK, what's the penalty for failing to log?

Grayhawk is in trouble now!

PS Maybe I will keep it as accurately as I keep my VOR test log...............