I have two different kinds of GPS track records from different database and have different columns and I wanna to plot it on the same map,
now on Tableau I could only create 2 sheets to display the maps but I can't merge them into one, is there any way to plot it together?
The only way you can do this is to merge your data together perhaps through a union such that the lats and lons are in the same common field. While Tableau supports dual axis maps, it still requires the same lat/lon field be used for the 2nd axis.