> Military jammers can be much, much bigger. As big as a 5,000,000x Loran transmitter even!
Which can become a target themselves.
> I think in reality, it’s easier to put little star trackers on your boats and planes.
The star tracker in this article is €250K: that may be 'affordable' for a plane manufacturer or a >5000 TEU cargo ship, but perhaps less so for smaller commercial and recreational boats. Meanwhile a survey of Loran-C receivers published in 1984 had some units available down to the USD 2000 range:
I would think that the development of electronics over the intervening decades would allow for units to be much cheaper now. A (touch-screen) chart plotter with built-in GPS is available for as little as USD 800:
At the end of the day, it's probably more about both-and and not either-or. The more you want to reduce risk, the more independent systems you want to use to tie together to create a better model of reality with regards to where your location "is".
And if you don't want to rely on electronics at all, then you can also get a mechanical watch and a sextant, which was done even on aircraft:
Which can become a target themselves.
> I think in reality, it’s easier to put little star trackers on your boats and planes.
The star tracker in this article is €250K: that may be 'affordable' for a plane manufacturer or a >5000 TEU cargo ship, but perhaps less so for smaller commercial and recreational boats. Meanwhile a survey of Loran-C receivers published in 1984 had some units available down to the USD 2000 range:
* https://rosap.ntl.bts.gov/view/dot/11795/dot_11795_DS1.pdf
I would think that the development of electronics over the intervening decades would allow for units to be much cheaper now. A (touch-screen) chart plotter with built-in GPS is available for as little as USD 800:
* https://www.westmarine.com/multifunction-displays-combos/?sr...
Compare its capabilities to a (LCD screen) Loran-C receiver from 1990:
* https://sarmarine.com/product/raymarine-raynav-780-loran-c-r...
* https://www.manualslib.com/manual/313978/Raymarine-Raynav-78...
At the end of the day, it's probably more about both-and and not either-or. The more you want to reduce risk, the more independent systems you want to use to tie together to create a better model of reality with regards to where your location "is".
And if you don't want to rely on electronics at all, then you can also get a mechanical watch and a sextant, which was done even on aircraft:
* https://www.youtube.com/watch?v=xc3rAlCDf54
* https://www.youtube.com/watch?v=C7gAiI79nOY