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>On Sunday, February 9, 2003, at 08:00 PM, Gary Harkins wrote:
>
>>Did it show both the rhumb line and Great Circle or did it show the
>>rhumb line but follow a Great Circle?  I was just playing with a
>>Garmin unit that was still on the shelf of our local Boaters World and
>>it only showed the rhumb line even though it was going to follow a
>>Great Circle.
>
>
>Dan replied:
>
>Nowhere in the Garmin GPS settings and options are the terms rhumb line
>or great circle used.  However, if you create a route with two points,
>Seattle and London for example, the map will show a great circle route,
>and the course given will be the initial great circle course
>(approximately 34 degrees in this example).  This course is curved when
>seen on the map in this example.
>
>The rhumb line is a bit tricky to find.  First make sure that the route
>you just created is made active.  While viewing the main map view press
>menu to see "Setup Map" (this is on my Garmin GPSmap 76), and then find
>the "Line" tab within "Setup Map".  On that page there is an option
>called "Bearing Line".  If you turn this on you will see a rhumb line
>that will be drawn at approximately an 88 degree angle for our
>particular route in this example.  This is the rhumb line bearing from
>your current location to the next waypoint or to the destination.  This
>line appears straight when seen on the map in this example.

And in the same Line tab (same GPS model), if you turn off the Course line,
you end up with only the "rumb line" to your destination.

Pierre Boucher

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