FEEDBACK:
The PDF resizes and gets into focus better, now, in Adobe Reader in my Android 4.2 and Android 4.4 Apple "Mini" and Apple "Air" size "phablet" tablets.
I don't know, why it did not work well. It does, now.
It lacks, however, much scope for "pinch and zoom".
The Guthook CDT Demo and Montana offline Map, Photos and Data works well for iPod Touch 5G from the start.
It has sufficient scipe for "pinch and zoom".
There is more that needs to be done for Android.
The Guthook CDT Guide, Guthook CDT No. Montana I "tried" are not functioning at all: crashes upon opening.
I did get it to install in the Android 4.2 "Apple Mini" size "phablet" tablet, however, I could not download offline Map or offline Photos. I did download offline Data.
It did not display any "online" Map, Photos, or, Data.
Next, it would not Open. There was a "popup" the app must have Google Play.
Next, I tried to download and install Guthook CDT No. Montana on the Android 4.4 "Kit Kat" "Apple Air" size "phablet" tablet, I think, because I tried after I tried the first.
I think the problem with the Android-version app is relying on Google Play.
BOTTEM LINE:
Google Play is frequently "down" or "freezes".
It is not reliable for any app that needs to download more than a few "kb" to function.