Looks cool, but you need GM17 in order to exchange any data with the app: http://www.bluemarblegeo.com/products/global-mapper-mobile.php?aid=EMGMM616
I was on the beta team for this app. The product is very cool with a ton of possibilities, but still needs a few tweaks IMO.
I started a thread on iOS mapping tools awhile ago. Mostly, it was just me talking to myself. ;)
https://forums.gpsfiledepot.com/index.php?topic=4043.msg22695#msg22695
Haven't spent much time on this recently, actually have not spent much time making maps at all. :) I am still a CaroMobile beta tester however. https://www.macgis.com/mobile.php It's not bad, but I would prefer to have something that directly integrates with Globalmapper. Just not ready to spend the $$$ to upgrade to the new version though.