[mkgmap-dev] Inter tile routing problems

Wed Mar 11 16:15:54 GMT 2009

On 11 Mar 2009, at 6:46 , Clinton Gladstone wrote:

> On Wed, Mar 11, 2009 at 12:56 PM, Toby Speight
> <T.M.Speight.90 at cantab.net> wrote:
>> In general, it might not help anyway.  Consider a route that goes
>> due north/south, close to the tile boundary.  If it weaves slightly
>> east/west and back a few times, it will cross tiles quite a lot -
>> even more so if all the tiles are aligned.
>
> A naive question: could some of the inter-tile routing problems be
> caused by the lack of an overview map?
>
> Could it be that Garmin falls back to the larger routes defined in the
> overview map for longer distances, thus avoiding the intervening tiles
> completely?
>
> This is pure speculation; I have no evidence to support this. But
> could this make sense?

good point. on the Etrex it seems sometimes it falls back to basemap  
routing for some parts. other times I get a out of memory message.  
it's just a random effect. Even Mapsource gives up on very long routes  
but can route all of it in shorter segments.

>
>
> Cheers.
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