I know that Oruxmaps will work with the Polar H7, if the phone is on
Android 4.3 and has BLE (aka. Bluetooth Smart).
Samsung offered for Android 4.2 a dedicated BLE SDK to support BLE
on their capable phones (like the S4 and the S4 Active).
I tested two applications from the Play Store to verify, that the Polar H7
is also working on Android 4.2 for Samsung S4 and S4 Active.
Unfortunately there is no Android 4.3 for the Samsung S4 Active, yet.
Would it be possible to have a look at the Samsung BLE SDK to see, if
it is feasible to support BLE on Samsungs 4.2 based smartphones in
Oruxmaps?
This is the link to the Samsung BLE SDK: