I wrote a procedure a while back and posted a pdf with instructions how to export multiple waypoints. See post #5 in the link below for copy of the pdf.
The instructions are for FishSmart but will also work for One Boat Network app although I have found a couple of bugs when doing it.
My understanding is you can export multiple waypoints on an Android device.

https://www.bbcboards.net/showthread...=#post12797622