Navonics are obsoleting Navionics boating app ..
And upgrading it to Boating HD Marine and Lakes version.
I have upgraded on android 4.2 android 5 and android 8
Seem a little confusion by some to be able to follow instruction on google apps.
1/ update.
leave the google apps window there
2/ once updated , hit open
3/ it will open, maybe a little slow, "loading" also maybe little slow on older android versions, then will "unpack items" little slow then ask you to "lets go"
4/ Hit ok
5/ will once again ask you to download off line maps.. select area and download. I select the whole of the Nth Island.
You will notice that you now have 2 installs of navionics.. the old version and the new HD version.
You can now safely uninstall the old version.
Routes, tracks, note, settings, are all there.
Even the "you have 12 days to renew subscription "
I have not checked that the lowrance is still "connected"
Just in case .. I had backed up all the navionics device, files on each of the androids.. have not needed them.
A very well coded for a complex update