Oh dear!

I'm sure you will get the hang of it quicker than you think right now.

Have you thought of doing a bit of video research to help when the Tome and you don't see quite eye to eye? Joe Sweeney did a good short series on dungeon mapping here:

https://www.youtube.com/watch?v=Ekhz1CICTkM&list=PL1FFD4E50759762F1

PS - I know I shouldn't have because it's not really funny when people can't get things to work, but your blues did make me giggle - reminded me of my own first dungeon mapping experience ;)

Fungus is on the list Julian.

Thank you! I think it's probably just that a change is good every now and then.

I'm not doing an entire dungeon style - just the crypt aspect for now.

No. It was meant as a solution to help you produce a shape to draw your border areas, which I noticed were lines of set width along the coast. You can't draw lines that thick and that wiggly without those artefacts you mentioned. The solution is to draw them as polygons with lines of zero width, but around the outline of the intended line. That would require a guide shape to do by eye, so the two glows act like a template - a drawing guide.

However, it is possible that I have mistaken your intent. I was working on what I could see in your shot.

Lines can be prone to this, and so can offsets, so there's no point in me suggesting that you use offsets instead.

In this situation, where the borders don't have an edge of something to follow (like the land itself), I would probably add a temporary sheet effect or two to the land sheet to use as a guide to hand draw the border. This is a square of grass texture on the FLOORS sheet of this dungeon map I'm working on. I've added two temporary sheet effects to mark a 5 map unit distance outside and inside the perimeter of the grass square. The outer corners are rounded, but if you were measuring exactly that amount from the corner they would be rounded.

This is not the normal use for glows, so I have shown you both effects so you can see how to set them up to use them like an automatic guide.

I would delete them both when I was finished.

You're welcome :)

I learned everything I know on this forum, or from the many video tutorials and live mapping sessions, and from the Tome, but most of it was by asking questions right here - so I'm just passing things on in the traditional way ;)