# Crossover adjustment of ship-borne gravity data using x2sys package **URL:** \ **Category:** Q&A\ **Tags:** gmt\ **Created:** [January 14, 2021, 4:04am UTC](https://forum.generic-mapping-tools.org/t/crossover-adjustment-of-ship-borne-gravity-data-using-x2sys-package/1204 "2021-01-14T04:04:37Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![m.magdy](https://avatars.discourse-cdn.com/v4/letter/m/e47774/32.png) [@m.magdy](https://forum.generic-mapping-tools.org/u/m.magdy)\ **Post date:** [January 14, 2021, 4:04am UTC](https://forum.generic-mapping-tools.org/t/crossover-adjustment-of-ship-borne-gravity-data-using-x2sys-package/1204/1 "2021-01-14T04:04:37Z")
Hello, I have some tracks data files of ship-borne gravity in geographic coordinates and i need to crossover adjust these data using x2sys package but I don’t know how to start. any help please. ---
**Author:** ![Joaquim](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/joaquim/32/16_2.png) [@Joaquim](https://forum.generic-mapping-tools.org/u/Joaquim)\ **Post date:** [January 14, 2021, 3:25pm UTC](https://forum.generic-mapping-tools.org/t/crossover-adjustment-of-ship-borne-gravity-data-using-x2sys-package/1204/2 "2021-01-14T15:25:04Z")
The best help you can get right now is to study the documentation. ---
**Author:** ![maxrjones](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/maxrjones/32/2698_2.png) [@maxrjones](https://forum.generic-mapping-tools.org/u/maxrjones)\ **Post date:** [January 14, 2021, 10:05pm UTC](https://forum.generic-mapping-tools.org/t/crossover-adjustment-of-ship-borne-gravity-data-using-x2sys-package/1204/3 "2021-01-14T22:05:05Z")
Also helpful will be [Paul’s paper describing the package](http://www.soest.hawaii.edu/wessel/xover/Wessel_2010_CG.pdf) and possibly the test scripts that reproduce the figures in the paper which are in the [test directory of the GMT repository](https://github.com/GenericMappingTools/gmt/tree/master/test/x2sys).