Ok, thanks for that info. I'm using an HTC Desire 510 here. Not sure how old it is, but probably close to 5 years. Specs: 4.7" screen 480x854 pixels 16:9 ratio. Android 4.4.2 So that's what it is anyway. I really like the compass and find the interface quite intuitive and easy on the old eyes too. Great job. Thanks Fred.