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<blockquote data-quote="MikeFromMesa" data-source="post: 1827205" data-attributes="member: 305741"><p>I am sure that what you have written is absolutely correct, but I am not particularly interested in terrain mapping. We travel in an RV and that means that part of our decision as to where to stop for the night depends upon the local temperatures - can we sleep in the heat or will it freeze - and that often depends upon the elevation. Where we live, in southern Arizona, we need to be above 5000 feet to have a decent chance of sleeping at night during the summer and the same is true for neighboring states like New Mexico and Nevada, so the elevation is important to us.</p><p></p><p>Navigation systems get gps signals and the position of those satellites is known by the system. It seems a relatively simple thing mathematically to compute the elevation based on the angles of the satellites and both our hand-help Garmin (which is so old it no longer works) and our old Rand McNally portable nav system gave us elevation but our Sync 3 nav system from Ford (which is built into our RV) and the one from Chrysler built into our Jeep do not do so. Neither do Wave or Google Maps, at least as far as I can tell from my limited use of them, and that means that I end up having to use an app for my phone, and as simple as the computation should be I just don't see why the nav systems don't provide it.</p><p></p><p>I am sure you are right about the elevation data for terrain mapping, but I would be perfectly happy with gps computed elevations.</p></blockquote><p></p>
[QUOTE="MikeFromMesa, post: 1827205, member: 305741"] I am sure that what you have written is absolutely correct, but I am not particularly interested in terrain mapping. We travel in an RV and that means that part of our decision as to where to stop for the night depends upon the local temperatures - can we sleep in the heat or will it freeze - and that often depends upon the elevation. Where we live, in southern Arizona, we need to be above 5000 feet to have a decent chance of sleeping at night during the summer and the same is true for neighboring states like New Mexico and Nevada, so the elevation is important to us. Navigation systems get gps signals and the position of those satellites is known by the system. It seems a relatively simple thing mathematically to compute the elevation based on the angles of the satellites and both our hand-help Garmin (which is so old it no longer works) and our old Rand McNally portable nav system gave us elevation but our Sync 3 nav system from Ford (which is built into our RV) and the one from Chrysler built into our Jeep do not do so. Neither do Wave or Google Maps, at least as far as I can tell from my limited use of them, and that means that I end up having to use an app for my phone, and as simple as the computation should be I just don't see why the nav systems don't provide it. I am sure you are right about the elevation data for terrain mapping, but I would be perfectly happy with gps computed elevations. [/QUOTE]
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