The logbook feature is used internationally, so the legality of logbook endorsements may vary from one country to another.
In the United States, the FAA has provided Advisory Circular (AC) No. 120-78, to help guide users in the use of electronic signatures and record keeping. The AC is not regulatory but helps guide pilots on how to comply with regulations.
For more information on the use of digital logbooks, see Susan Parson's article in the May/June 2016 edition of the FAA Safety Briefing publication, eLogbook Logistics: Considerations for Moving from Paper Log to Digital Log.
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