I have an Ipad 3 (without built in GPS) has anyone any experience using either of the 2 GPS (Bad elf and GNS) in a Cessna 172 on a yoke mount?

I want to make sure the one I buy will work OK before ordering it. Thanks in advance

Hi Steve,

Thanks for your prompt reply.

Purely in the interests of furthering aviation research - and not because I, in any way, doubted your profound words of wisdom(!) - I switched my iPad on, loaded SD and then selected "Go Flying". Sure enough, the 'plane icon was yellow as it started to use its internal GPS. Then I took my iPad down to the garage under the house where I was sure it could not "see" any satellites, closed the garage door and the little 'plane icon turned red signifying a loss of GPS reception.

Then I switched on the bluetooth GARMIN GLO and noted that, although it paired instantly with the iPad, there was a flashing green LED signifying that it, too, had no GPS reception and the iPad SD 'plane icon still stayed red.

Then, I got the household's C-in-C to take the GARMIN GLO and stand outside the garage door. Lo and behold, the GARMIN GLO's green LED became solid - signifying that it had locked-on to some satellites - and the SD's 'plane icon turned yellow again!

Not only that, but when I instructed her to 'make like an aeroplane' outside the garage (without sound effects, of course!), the SD 'plane icon started moving about on the iPad screen! Fantastic!

Conclusion: An external GPS receiver bluetoothed to an iPad does override its internal one and you do, indeed, have to leave "Location Services" enabled!!

Thanks again!

Paul