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I have created a layer of lat-long coordinates in the map I am working with that. On the map, I can appropriately size the "simple marker" representing each point for a given zoom. However, when I change the zoom or select a portion of the map to put into print composer, the size of the dots change. The size of the dots then seem to change again (seemingly randomly, though I assume there is some underlying logic that I am not understanding) as I export the print composition as an image. I would like the dots to keep the size of the dots consistent at different zoom levels, especially when exporting the image from the print composer.

In the "Layer Properties > Style" I have tried various combinations of units ("Map Unit", "Pixels", "Millimeters"), but cannot seem to find one that gives me a consistent size across different zooms and, especially, in the print composer and exported image. I have searched around the internet, but have not located anything specifically about this issue.

Is there a way to ensure that the dots representing the points stay a consistent size at different levels of zoom, especially in the print composer and in exported images?

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    If you set the symbol size to "map unit" it should give you the option to control symbol scaling; via the little spanner to the right of the dropdown box. This should allow you to lock the size of the symbols - is this what you're looking for? – Ed Rollason Feb 8 '16 at 17:41
  • @EdRollason - You should post your comment as an answer =) – Joseph Feb 9 '16 at 10:18
  • Will do - thought it might fall foul of the "asking for clarification" rule. – Ed Rollason Feb 9 '16 at 16:01
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If you set the symbol size to "map unit" it should give you the option to control symbol scaling; via the little spanner to the right of the dropdown box. This should allow you to lock the size of the symbols and stop it scaling them.

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