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SiliconFiend

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Everything posted by SiliconFiend

  1. Thanks for the link, I'll try it tonight! Lalita I've had good luck with ogr2ogr which you can download here (FWTools). It's great for converting between different formats, and for converting datums and projections.
  2. LifeOnEdge, I've agreed with most of your posts about people overreacting to small bugs or unmet expectations (the curse of the early adopter), but if you read the posts, there really does seem to be a problem here with the Colorados not keeping time. Just as the Colorado bashers are overdoing it, you're not helping by being an unmitigated apologist for Garmin. Everyone just calm down the flames.
  3. I'm surprised that worked. Changing the tire size will change the ratio, so it will be more incorrect as you increase speed. It's not just an offset (which is what you did by removing and reinstalling the needle). What you probably did was to remove the offset that manufacturers put in to make the speedometers read slightly high by default, so instead it was dead-on.
  4. This is incorrect. A GPS receiver calculates speed using the Doppler shift of the GPS signals, similar to the method used for the radar gun.
  5. Not to be argumentative, but a 37,000 foot crusing altitude (typical of most commercial flights I've been on lately) is at the top of the troposphere at US latitudes, with 75% of the air mass below. The troposphere only goes up to 65,000 feet in the tropics. According to Wikipedia at least - > http://en.wikipedia.org/wiki/Troposphere I'm glad you acknowledge that the atmosphere is more than just the thin layer that is the troposphere. I was just correcting your misunderstanding about what WAAS is for. It's to compensate for distortions in the ionosphere, which is still well above you. Air and water molecules and weather in the troposphere have a negligible effect on GPS signals.
  6. Actually, when you're cruising at 30,000 feet, you still have more than 90% of the atmosphere above you. The part that affects GPS signals the most is the ionosphere, around 100 km up. Even the lowest layer that you're probably thinking of, the troposphere, goes up to about 65,000 feet. However, your point about WAAS being useless in this situation is still pretty much right on.
  7. Garmin's tech support is based in the US, most likely at their headquarters in Kansas.
  8. Someone mentioned the magnets in the Rock-n-Roller and wondered if its magnets affected the compass calibration. If so, that would be a huge blunder on Garmin's part. You could probably try it easily--calibrate the compass and test it out, then move the wheel one notch and test it again. Move the wheel back to the original position and see if it comes back (it may not).
  9. Everyone who has road and/or trail data, please consider contributing it to OpenStreetMap. Check out the project (www.openstreetmap.org) and maybe get involved!
  10. Nobody mentioned it because it no longer matters. Seriously. In fact, a few reviews showed the HCx picking up more satellites, with stronger signals, than a 60CSx under the same conditions.
  11. Generally for batteries, you want to store them at cold temperatures to help retain their charge, but use them at warm temperatures for maximum run time.
  12. Miragee was saying it used to be like that. Now with the new firmware upgrade, the Vista HCx is registering more moving time and less stopped time than the 60CSx. No, not quite The distance is much closer to the 60CSx compared to the way it used to be, but the Stopped time is greater than actual Stopped time. It seems to be registering speeds slower than some number (1.5 mph, 2 mph ???) as Stopped. Before I installed the new firmware, the distance traveled was less than that of the 60CSx, sometimes by almost 1/3 . . . Oops, I read them backwards. Looks like they fixed the odometer problem (sort of--they may have overshot) but the same fix needs to be applied to the moving/stopped time.
  13. Miragee was saying it used to be like that. Now with the new firmware upgrade, the Vista HCx is registering more moving time and less stopped time than the 60CSx.
  14. No, it's for the barometer. They use only one case design. On the units without the barometer, it's just a hole.
  15. By the way, it's not a Sirf Star III chip. It's thought to be a MediaTek, or perhaps something that Garmin has come up with on their own.
  16. I noticed that too, after the most recent chipset software update for the Vista HCx. But I'm convinced it's a (newly introduced) display error. I have the EPE set up as a display field on the compass page, and when it's showing 2 m on the sat page, it shows 3 m on the compass page. Further, if I change the units to Statute, it shows +/- 9 or 10 ft on the sat page. That's bigger than 2 m, obviously.
  17. I believe that's the only place it's available. Bafflingly, you can't choose the color, and the current available color is a brown/tan.
  18. I got two of the screen protectors with the case. I'm not sure if that's normal, though, or just a packaging mistake. Mine also came with two. Reading the reviews on Amazon, that appears to be normal.
  19. I know a bit about this. The easiest way is to use GPSMapEdit. Load up your custom map (in MP format), then select Tools->Generate Routing Graph->Using Coinciding Nodes of Polylines. This will create all the routes on the trails quickly for you. Then you can edit them manually as necessary. Then do a Tools->Verify Map and fix all the problems that show up. Then, once you have everything fixed, upload it to MapCenter (mapcenter.cgpsmapper.com) and in a short while you should be able to download your routable map img and upload it to your GPS and test it out.
  20. I got two of the screen protectors with the case. I'm not sure if that's normal, though, or just a packaging mistake. The Amazon page says Lifetime warranty (against defects and workmanship, not necessarily user damage), but I doubt they have to replace very many cases--it's very sturdy.
  21. For Garmin devices, I believe the National Park 24k Topos have routable trails, but obviously only in their coverage areas. This has bugged me, too, and it's part of the reason I joined the OpenStreetMap project. Once I get routing working, we should be able to create routable trails as well as roads. No more switching to off-road navigation to get to the cache!
  22. <snip> As for accuracy and precision, accuracy refers to how close an observation is to reality. For example, if the temperature outside is 12C and your thermometer reads 20C, your thermometer is not accurate. If your thermometer reads 20.00036C, it is precise (can more precisely read the temperature to more decimal places) but not accurate. You're right about accuracy and close about precision. Precision has more to do with repeatability, although resolution is part of it. Some examples from target shooting (or darts, if you wish): Scatter of marks around the bullseye, in a 5-inch circle: Good accuracy but poor precision. Cluster of marks within a 1-inch circle, offset 3 inches from the bullseye: Good precision but poor accuracy. Generally, over a short time frame, GPS receivers have better precision than they do accuracy, due to systemic errors (some of which WAAS helps to correct).
  23. Backup? I had 3 copies. I gave the short story above, but here is the long story. I was running two drives mirrored as my primary drive. I had a 3rd drive as a backup and used SyncBack to backup my files to the 3rd drive over night. Then my motherboard died. So I put in a new motherboard and Windows would no longer boot up. It would start to boot and then get the BSOD. I am guessing that it is because it was using RAID drivers for the old motherboard that aren't compatible with the new motherboard. So I figure since I have 3 copies of everything, I would just wipe one of my previously mirrored drives and do a clean install. So I get Windows up and running again with all the patches. Now it's time to copy my data off the other drive back to my primary drive. Well, where I run XP Pro with multiple logins, it would not let me into my old "My Documents" folder. It was secured and locking me out! So I panic a little but decided to just get the data off my third drive. Guess what? It says my drive isn't even formatted! Now the panic sets in. One of my three drives was wiped to do a clean install, one says it isn't formatted and the last one is secured and won't let me in. So I went googling. The first item I find tells me how to get in as the machine administrator, grant myself authority to the folders, and get my data! So now I have most of my data, though it will be a couple days before I figure out what might still be in other places on the old drive. I avoided digital death this time, but it sure has me reconsidering how to safely back up my data from now on. But since I didn't see myself die in the digital world, I don't know if I would die in the real world. The good news is, my Topo maps were delivered last night and I am reading the 3 sweetest words that can be said together on the UPS site: "Out for Delivery"! I guess you've discovered that RAID != backup, especially when dependent on a particular RAID controller and drivers. I'm using Linux and software RAID (which has just as good performance as an unaccelerated RAID controller) and has the advantage of working on any Linux install (including a LiveCD). However, despite that, I still have DVDs of all my photos stored in a fire safe at my parent's house, 4 hours away. That should be "offsite" enough. If it's not, we all have bigger problems to worry about.
  24. Except the Garmin unit ALSO display a continual estimate of the averaged accuracy. This lets you know if the averaging is making things better or worse. It works very well. Yes, I've used the function myself and agree that it's useful and should be included in the Colorado. There's a funny (confusing) thing about that function, though. Averaging should never make the accuracy worse (the average should be converging on the true location as more samples are collected), but it may make the precision worse, in the near term (if the reported EPE is increasing while you're averaging).
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