Been a bit puzzled as to why Basecamp has been giving me straight lines across country (as if I'm in a plane) rather than following roads like it should/.

I'm using an OSM routable map and when planning an IBA trip round Ireland (seven waypoints) I noticed that only one section was properly routed- between two waypoints that were relatively close together.

After reinstalling basecamp in case it was corrupted (it wasn't) I tried two routes: Dundee to Tomintoul (about 80 miles) and Dundee to Inverness (about 145miles) and BC failed to plot the longer route, but had no problems with the shorter one (both in the same direction BTW).

Is there an upper limit between waypoints that BC can't cope with? My tests suggest there is, and is there any way of getting round this- online mapping eg Google will calculate a route clear across Europe between two points.

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and cannot replicate your problem. I am assuming that you have checked that your routing setting isn't set at 'DIRECT' aka as the crow flies?
see pics
221.62 Kms
Map is OSM downloaded 23 Oct 2013
Click on pics to enlarge
For my sins ( and there are many!) I have never understood the need to plan a single route over huge distances.
Huge routes, when you will take a wrong turn, as you inevitably will, take a loooooong time to recalculate.
IMHO, best practice is to make routes by all means if you want those but keep them short aka a day's average ride.
My 2 pence

We-e-e-l technically this is a one day route- an Iron Butt ride around Ireland

I've basically disabled all route avoidances. When I set up the Ireland route it just went point to point in staraight lines apart from one section where the waypoints were quite close together. I've managed to get it to plot a route following the roads now, but I had to add quite a few extra waypoints to make it work. The ride is only 800 odd miles, not here to Magadan!

How do I post screenshots of BC- you might be able to spot what I'm doing wrong.

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It is not impossible that there may be a node or three missing in the OSM route which maybe causing a glitch in the calculation.
Try the following:
1- Ensure your version of BC is the latest one
2-Manually create a series of waypoints in BC
3- Create a new route in BC by drag and dropping your points in the routing window and see what transpires.

You may want to check the settings in the Motorcycling profile in BC to make sure these match those in your gps.
Shortest, fastest, avoidances etc etc
Soooo many settings!

When BC is running ( or anything other program for that matter, you can take a screen shot of what you see- 2 options - one where you use a rectangle to select an area you wish your image to be or one which takes the whole screen.
Opening (in windows) the resulting image ( Open with option) the little program called 'Paint' enables you to add arrows/lines/text etc etc to your screen shot.
Then you chose ' Go Advanced' and chose 'Manage Attachments'
Select each image then press upload when replying on the Hubb to add images to upload.
Tip - resizing your screenshot image to 800 X 600 size reduces upload time and clutter on HU!

Why anyone would want to 'iron butt' around Ireland is beyond me! There are so so many simply fabulous places to eat, drink and be merry there! Durty Nellys to mention but one!
Ahhhh fond memories of the Emerald Isle and its fun loving people. (except that little turnip who insisted I leave the pub at 04:30 really.... !! )

Durty Nellys is here 52.696387,-8.811943

One straight line using waypoints I already had...



Settings

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Its a common problem with OSM mapping. I use Map-source and can get the straight line routing at times. Solution as you have found is to put in more route shaping way-points and everything will work fine, if it does not always work on some segments you will find a break in the road somewhere on tight zoom in.

Seems to work fine in Mapsource. Bit irritating when the all singing and dancing newer product doesn't seem to work!

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Have to say, I much prefer using Map-source to Base-camp any time.

Tried to do the Ireland one in Mapsource and it's also misbehaving, although not as much as Basecamp. Looks like there is an issue with the map. I download from the one mentioned by Colebatch in the OSM thread- is there a better (or at least, different) one to try?

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Presume this is where your getting your maps.....
Free worldwide Garmin maps from OpenStreetMap

Works fine for me in Map-source.....most of the time !

Yep, that's the one. Guess I'll just have to ease off on the distances between waypoints. Ho hum.

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There is no reason why it should not work Reggie. I've demonstrated above that it does.
May I suggest you spend a little timer reading this? I think it may help you.

Thanks Bertrand. Had seen that before, and I needed reminding of the snap tool which certainly helps a great deal. Too many bloody devices to try to remember...

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Take a look at this tutorial on BaseCamp.

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