I used this morning version 0.9.28.9 with an external Bluetooth GPS. It worked with following:
1.Start external GPS and wait for fix.
2. Start GPS Provider (it starts system Bluetooth after a you confim it too) (thanks for this advice to berkley)
3. Connect GPS Provider to external GPS and look if GPS is fixed (got enough satellites)
3. Start Locus
5. open GPS screen and activate GPS
6. deaktivete GPS !!
7. Activate GPS once more
8. start recording track
That worked fine for 30km by cycle

It saved at lot of battery.
with version 1.1.1.1 seems to be the same, you have to activate GPS, is this correct? But it is not the system GPS, but only the Locus internal GPS?
J.