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GPSMAP 67i not working without GPS?

9078180

Hey everyone, im a hiker, explorer but also a developer and innovator. 

As part of that i am working in ukraine to support some critical efforts there. 

In Ukriane and especially in zones like that (not my only difficult place) and especially in support zones the GPS signal is spoofed and jammed. (both). 

Now i have specifically bought the 67i as the support and outdoor rep that i interviewed for 1 hour said that it works for positioning AND messaging over multiple avilable constallations. 

GPS, GLONASS, Galileo, QZSS, BeiDou, and *IRNSS. 

BUT the reality was that the moment GPS is gone (spoofed and or jammed) i can no longer even use the device. It will jump to the false gps location even though it got good lock on and true position on some of the other constellations (e.g. Galileo). 

So how to fix this? 

Is there a solution for priority overwrite? Can i disable a channel? Can i force localisation over other networks? 

  • 0

    Just as a follow up, i did some research and asked for advice on some of it. So when i was for example close to Kyiv there was of course at times during air raids broad spectrum wide coverage GPS jamming. Just noise. So no, of course in this situation i am sure no handheld device will work. At least not in this caliber.

    BUT 

    Most of the time its "just" GPS and Glonass  that is blocked. Especially with multi band support and anti-spoofing etc. etc. available there should be some reception.

    I did test my M10chips that i had with me anyways, and on my notebook i can get a positive lock. Down to 50m approximate. Not bad at all. That was L1 and L5 Galileo and smth. else. But my point is, there are options and it should not be GPS first, black and white. 

  • 0 in reply to 9078180

    Sounds like Garmin devices are using all other Full Service GNSS systems as 'Augmentation Only' and relying too heavy on GPS itself?

  • 0 in reply to atlas_cached

    Yes it seems like it is almost fake advertising to me. If you advertise 4 band positioning and full redundancy it is at least weird and probably false advertising to claim that functionality. I will do some testing. We have full testing and jamming suite in the lab. I will put it in the chamber and provide only individual bands as signal source without gps. When it does locate, its fine. If it only triangulates position based on GPS and uses the rest for higher precision it would kindly ask Garmin to take it back.