Changing map from A1 to another

[Kaylet 0]

Wondering how I can change my default map to another grid? The default is A1 but i want to explore other grids on my 1x1 server to find one of the hard islands

[ForceTrainer 7]

You'll need to use the server grid editor to modify your grid manually.  Nitrado has a good write up here with links to the server grid executable on github.