I have S&T 08 & 10, SeaClear II, and Google Earth with Topo overlay. Streets & Trips will let me measure the distance, but doesn't allow me to enter the course angle.

Any suggestions?

If you start from a known spot (as it sounds like you intend), you can create a right-triangle, using two legs of known length in the area that is accessible. That will allow you to compute the angles of the hypoteneus to those other two sides of the triangle. Or if you have the angle, you can calculate the heading using the geophysical coordinates, which Streets & Trips provides, and vice versa.

On the Garmin Oregon, for instance, you can enter a distance and bearing and it will project to the waypoint from where you are.

My eTrex Legend HCx also has this feature. It's not exactly intuitive. It projects one waypoint from another waypoint. So if you want to project the new waypoint from where you are standing, first you must create a waypoint where you are standing. Then you can select that waypoint and project the new waypoint from it by using the distance and bearing to it.

I think it's just doing the geometry calculations that SpadesFlush described. The advantage is that you can then walk the line to the projected waypoint using the hiking navigation features of the handheld. That is, the handhelds will give you some sort of navigation screen that normally includes a compass rose with indicators for your bearing (where you want to go) and heading (where you are currently going) so you can zero in on the desired waypoint.

There may be similar software for the laptop but I've never looked.

...ken...

How to Project a Waypoint <edit>Expired link was removed</edit>

The next step would be to ask the handheld to help you navigate to the projected waypoint.

At the bottom of that page is a link to a Great Circle Calculator. If you scroll to the second entry you can "Compute lat/lon given radial and distance from a known point". This does the math SpadesFlush was talking about. If you can find something that will help you navigate there with a laptop, you can just plug the coordinates in. Sea Clear II might do the job for the straight-line navigation part??

...ken...

Yes, Ken, "projecting a waypoint" is exactly what I would like to do. I was aware of the feature in handheld devices, but I had forgotten the terminology.

I will check out your suggestions, do a bit more research and re-post.

Thanks.

Edit: I downloaded FizzyCalc. It looks like it will get the job done, nicely. It is a small .exe program. It has a "Projection" tab that opens a small page to enter your starting point, distance and direction. It, then, calculates the needed waypoint. Enter that into your existing gps program and you are good to go.

http://www.fizzymagic.net/Geocaching/index.html

...ken...

Similar Topics:

© laptopgpsworld.com About