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    Re: GPS trick: compass rose waypoint
    From: Joe Schultz
    Date: 2010 Feb 3, 12:05 -0800

    Yes, but you don't need to limit yourself to the compass rose. Grid your chart/map if it isn't done for you, and label the intersections G1, G2, G3, etc. Then put those waypoints into your GPS. Now you can fold your chart/map (gasp!) and put into a gallon sized Zip-Lok freezer bag. I learned this from a smokejumper, and the technique is sometimes taught to landlubber SARs. Aviation assets don't like to use UTM, especially the older pilots who'll work for free.

    Our fearless moderator said "Naturally the accuracy of a "polar plot" like this from a fixed waypoint decreases as distance increases. As always, common sense is still required."

    Agreed, as to the second. But not necessarily so to the first. I encourage folks to transfer latitude ticks to their gridded meridions - then it's an easy two-step for the range.

    Doing it this way is intentional for me. Like it or not, GPS is primary for most folks. If the GPS dies then it's an easy transition to compass LOP technique - you've been doing it all along, with the GPS giving you a freebie range, and you've become proficient at plotting angles before you need the compass. No need for a tired brain to completely change the train of thought, in other words.


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