The default maximum map size in Surfer is 120". You cannot create a map larger than 120" by default. If you wish to do so, you can increase the maximum plot (map) size to any number up to 2000".
To do this, follow these instructions:
- Click File | Defaults.
- In the Settings field on the left side expand Miscellaneous and select PlotSize.
- Enter the new maximum plot size in the Setting value such as 200.
- Select a Setting Persistence value (use Always reset to always keep this plot size).
- Click OK.
- Click Yes to save the changes to the surfer.set file.
- Restart Surfer.
Updated September 19, 2017