Hi.

The main reason behind why there are so many different implementations is to prevent lockout by a country if there was only a single system.

Yes, I remember now to have read that GPS had been invented for military reasons, so a plethora of Chinese gps signals, on top of the American ones, will only become of interest when the U.S. satellites send out deviated signals, for the aforementioned reasons, but I suppose we'll have bigger problem than then sightseeing. But to be serious, I now understand why the shear number signals received is irrelevant, it's the quality the receiver that counts, or in other, as you say, don't buy cheap.

I still use paper maps, I've never needed a compass. All my maps are topographic, I can work out my position from what terrain I'm on, heading towards, or have driven through.

This made me spontaneously laugh out, not because I don't believe this but to the contrary, admirably, I believe you 100 %, you're an expert in these questions and know what you do, even in the wilderness.

I admire this all the more so since I do get lost rather often - I always try my best to train my senses, and then it's just another case of getting lost, so all I train is my sense of humor.

As for OS and size, it's difficult, "one size fits it all" does not apply. I'm really enormously fond of that Android 8" thing, don't want to name it for a third or fourth time here, but it's so cute, brilliant quality, and you can take it everywhere; it's got just the right size (and good resolution) for even looking up data and such, but it's not too big to go in your hand or in your purse. But for a quick glance in the car when driving AND getting all the necessary info you need, it's simply not big enough. And then, you always need to take it with you, some 500€ 10" or 12" device clearly visible in a parked car is an invitation to take it immediately away from you. So, even if you were willing to buy 2 such devices, which I'm not really, you would have to take the bigger one with you all the same, so to buy the 8" one for convenience reasons is thought to short since you will then have 2 of them to carry with you.

Which means when you need 10", you'll have to buy them, and then you will them carry around anyway, convenient or not, so no need for an additional 8". The S2 is available in 9.7", too... So no mobile ListPro for me, probably. I'll need it in Summer (travel season)...

Tablet prices have risen sharply in the E.U. but E.U. allows to send hardware back after trialing for some days, so I'll have to well prepare my double trial software-wise, and then I need both iPad and another tablet to be delivered more or less at the same time, and then I should even try them both in parallel for navigation, gps receiver quality and all. That's immoral, but prices are immoral, too: Apple prices anyway, and surprisingly, the Korean's prices do not show real clemency either. Well, they have big losses battery-wise to recover from.

But oh well, you know something about navigational matters!

Hi.

I am sorry, my post above was meant to be in the original thread: https://www.donationcoder.com/forum/index.php?topic=43427.msg405922#msg405922

You mentioned those other signal sources, beyond GPS: A-GPS, Glonass, TTFF, BDS - so these are all GPSsignals, just from non-GPS satellites, or in other words, technically, they are all the same, but they are named differently since the organizations behind them are different? And you spoke of 3m accuracy, your device getting signals from 18 out of 27 satellites. That seems perfect. So I suppose it depends on the device if it is able to get those signals other than GPS, too, and perhaps it's also a question of the map software then if it, or some intermediary software proper to the device itself, can aggregate all this info. You now also mention D-GPS / Differential-GPS, I suppose high-end navigation devices can treat them.

I believe you on your compass signal not being deviated in your car. It's just that I had had, with 3 different magnetic compasses, including 2 car compasses, at least they were sold as such, in 3 different cars, deviations of up to 100 degrees.

Thank you for the link which explains it very well. I admit my idea of differing signal strength for positions that are 100 or 200 m apart was a stupid one, but minute length differences are as surprising. But to answer your question, I thought the satellites also sent their position and an identification code, and that the receiver also receives lists of which satellite is where when or does what orbit and such, but you're right, spatial thinking is not for everyone, that's why I so heavily rely upon maps and compasses, and to be frank, my not wanting to buy a traditional navigation device for years was due to the fact that with maps on the passenger seat, I at least have an idea where I am, while traditional navigation devices of the kind I knew told you to go straight or to turn, but all between departure and arrival, you did not know where you were, except for city-limit signs on the road.

I've seen the slider in some map on my pc and agree that would be fine on the move, had not understood it there since on my pc it did not slide so as to the real direction coming into center. So this slider is no other that what I had imagined, plus the neighboring directions in order for people not having to remember that West is alway to the left of North, etc.

You sometimes speak of your receiver, which is obviously very, very good, and then you speak of your smartphones or tablets. What is your current receiver, or do you mean the one built into your current smartphone? 2m is awesomely impressive! Perhaps we could deduct that some makers use better gps receivers in their smartphones/tablets than others. This interests me a lot, since when in some town I do a 90-degree turn, it would be nice to have the map rotating after 15, 20 m instead of 150, 200 m only!