Thank you very much for your help and your quick answers.
This is the kind of data I have with my device : 31T 0712579
5285428
The data are directly given in UTM (WGS84).
I had a look on example 28 but it did not solve my problem – I would like to plot the data points on a map with a UTM grid. The data are included in two zones 31T and 32T and I don’t know how to set basemap in this case.
Could you please tell me how you would set basemap, coast and psxy in GMT for plotting these two points :
31T 0726090 32N 0284021
5231224 5239514
I thank you very much for your precious help.