geolocation.watchposition not working with network based location off

I am building a location aware app for Android using sencha 2.3.1 + phonegap 3.3.0, and use geolocation to show a list of destinations ordered by proximity to the user location. Everything works fine if the setting for network-based location is on. But if I turn it off and leave gps only based location then it never gets detected. The code is very basic, I tried both the sencha path:

Ext.device.Geolocation.watchPosition({
    frequency: 10000, 
    callback: function(position) {
      AppHelper.setCurrentLocation(position);//yeah!!

    },
    failure: function() {
        AppHelper.setLocationModeOff();//oouch!
    }
});

and the phonegap path:

var success = function(position) {
        AppHelper.setCurrentLocation(position);
    };
 var fail = function() {
            AppHelper.setLocationModeOff();
    };
   navigator.geolocation.watchPosition(success, fail,{ timeout: 30000 });

Result is the same, I tried waiting for a couple minutes for the geolock to happen but no sign of location service.

The phonegap location plugin is installed, the permissions are correct, and everything works if network location is enabled.

I am testing on a Sony Tablet S.

I am aware of this bug: How to get user position by GPS in Sencha But I checked the code and its is definetely fixed in sencha 2.3.1

I wil try on other devices but I was wondering if anybody experienced the same.

TIA.

EDIT: I made an experiment using standard html5 code on my android device using systems default browser (webkit based). I would access my settings page and change settings at each run.

Accessing http://html5demos.com/geo I get the following:

I started the device with network geolocation on and gps based location off: I get a message that asks if I want to share my location I say yes, only this time everything works fine.

Turn off network based geolocation, gps still off: Location detection fails. (as expected)

Turn on GPS, leave network geolocation off: Geolocation fails silently, I don't get a request to use my location and subsequent activation of GPS based gelocation.

So my conclusion is: this is similar to what I noticed in phonegap. If network based geolocation is on everything works as expected. But if I have no network connection and gps is on that is pretty useless in my html5 app.

At least this is what happens on my device (sony tablet)