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Navigation question (Projecting a waypoint w/GPS)
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... On Sat, 22 Jun 2013 16:23:37 +0000 (UTC), JohnF wrote: JohnF wrote: wrote: For example, beginning at 30 degrees N latitude and 89 degrees W longitude, I project a new waypoint at a distance of 10 miles with a bearing of 90 degrees. As expected, my projected longitude changes to a point further east. But for some reason, the projected latitude ends up at a higher latitude than 30 degrees. In my example, the projected latitude ends up as 30 degrees, 23.866 Minutes North. Excuse me for following myself up, but either I'm totally confused (a common occurrence) or that example's totally messed up... You say your waypoint's distance is 10nm, but its latitude changes by 23.866'. Heck, even if you headed exactly due north for 10nm, latitude would only change by exactly 10'. No, you're not confused. I'm just getting projected waypoints that make no sense. Fortunately, so far, my unit's GPS capability is spot on, so I can still use it to navigate (with backup). I just can't trust the "Projection" feature for accurate results. Never used it much anyway. By the way, I tried projecting 10 miles due north and it changed my latitude by 33' minutes. I'm done fiddling with it at this point. Thanks for the come back tho. Then you've got it set to magnetic north or it's stuck on magnetic north no matter how you set it. Set it to true north and try it again. -- Sir Gregory |
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