For practice, I just planned and simulated a route from Kemble (EGBP) to Turweston (EGBT).  I planned the route to the north of Banbury so as to be able to position for an overhead join to either runway (all circuits at Turweston being to the north).  However, before reaching Banbury I crossed the extended centreline of Rwy 09 (which, as it happens, with today's weather would have been the landing runway - but I was 15 nm out!) and SD flipped into virtual ILS mode.  Whilst the simulator continued to fly the planned route (exactly as I would have done!)  All the HSI information plus distance to go, time to go etc were now changed to reflect the 'ILS' 09.  I could find no way of reverting the display to Nav, nor any reference to this in the manual.

Surely crossing an extended centreline at your destination without intending to make an immediate approach isn't an uncommon phenomenon, so I can't believe that it's not possible to tell SD that a straight-in from that distance out is not one's intention?  I assume that I've missed something?

Gadget

(SkyDemon for Android v 3.5.0.19917 running on Samsung Galaxy Tab 3 8") 

Thanks everyone for all your input.  This has turned out to be quite interesting - I actually flew the trip on Sunday 3 April and didn't encounter the virtual ILS issue for real, even though the actual landing runway at Turweston was 09.   However, running the exact same route through the simulator just now did produce the issue.  Here we are happily en-route, approaching the Turweston extended centreline but intending to cross it to transit to the north of Banbury (positioning for an overhead join)...



And then, seconds later...



Tim, as you can see my crossing track is oblique to the centreline, so I can see why SD thinks that I might be commencing an approach.  And, although this didn't actually happen in the air on Sunday (why not?), what I am getting at is, is there an easy way to cancel Virtual ILS mode and return to en-route mode if it does? 

Turweston, like many UK GA airfields has no approach aids and no published IFR procedures, so I wouldn't bat an eyelid at planning to cross its extended centreline this far out.  There must be lots of opportunities for this to happen elsewhere - what do I do if my SD suddenly does this to me while I'm flying (and bear in mind that it is only by coincidence that the airfield in question was actually my destination) - can I get back to en-route mode, or do I have to do without until I emerge the other side of the centreline (which looks in this case as if it might have been maybe 4 mins)?

Gadget