WanMil,

Many thanks.

I have a little further information:

If I examine the screen on my GPS with a magnifying glass near to the 'thin blue line' artefact, where a road crosses this line there is an artefact crossing the road line also.  However this is NOT directly in line with the 'blue' line and is orthogonal to the road.  By this I mean that the artefact across the road is perpendicular to the road direction and therefore not parallel to the 'blue line along the tile boundary.

I hope this is clear and we can find a solution to this.

Bill.

WanMil wrote: 
I have just noticed 'thin blue line' (I estimate about 1 pixel wide)
along every tile edge )or border).  This is more obvious when I 'zoom
out' and it highlights my tiles because there is this blue sea-coloured
border around them.

I am using the Geofabrik GB OSM download and my relevant compile line is:
--generate-sea:no-mp, extend-sea-sectors, close-gaps=10000.

Currently using mkgmap version 1827

Has this been seen before and Is there a setting for me to avoid this?.

      
Just a bit more information:

Strangely, I can see the blue lines at the tile borders on my
  Garmin GPSMAP 62s but NOT on the Etrex Legend HcX of my Wife.  This is
using the exact same TYP file.

On examining the screen with magnifier it seems that the lines are 2 pixels
  wide
so I guess this is a one-pixel 'sea' border added to each tile boundary.

Any ideas?.

    

Bill,

I have an idea. The sea bounds are made one or two long/lats larger than 
the tile borders. Maybe that's the cause for it.
I will investigate it and post about my results.

WanMil
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