# Gps velocity map

**URL:** <https://forum.generic-mapping-tools.org/t/gps-velocity-map/1703>\
**Category:** Q&A\
**Created:** [May 21, 2021, 6:59pm UTC](https://forum.generic-mapping-tools.org/t/gps-velocity-map/1703 "2021-05-21T18:59:32Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![tugrul](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/tugrul/32/1282_2.png) [@tugrul](https://forum.generic-mapping-tools.org/u/tugrul)\
**Post date:** [May 21, 2021, 6:59pm UTC](https://forum.generic-mapping-tools.org/t/gps-velocity-map/1703/1 "2021-05-21T18:59:32Z")

</div>

Hello. Im new learner of GMT. i want to plot a gps velocity map in an area which described with latitude and longitude. can anyone help me in this? thank you

---

<div class="post-metadata">

**Author:** ![PlanetGus](https://yyz1.discourse-cdn.com/flex047/user_avatar/forum.generic-mapping-tools.org/planetgus/32/303_2.png) [@PlanetGus](https://forum.generic-mapping-tools.org/u/PlanetGus)\
**Post date:** [May 21, 2021, 8:00pm UTC](https://forum.generic-mapping-tools.org/t/gps-velocity-map/1703/2 "2021-05-21T20:00:43Z")

</div>

Have a look at the `plot` module at the `-Sv` section in the documentation (there’s this example at the end of the page) :

> If you need to place vectors on a plot you can choose among straight Cartesian vectors, math circular vectors, or geo-vectors (these form small or great circles on the Earth). These can have optional heads at either end, and heads may be the traditional arrow, a circle, or a terminal cross-line. To place a few vectors with a circle at the start location and an arrow head at the end, try

```auto
gmt plot -R0/50/-50/50 -JX6i -Sv0.15i+bc+ea -Gyellow -W0.5p -Baf -pdf map << EOF 
10 10 45 2i 
30 -20 0 1.5i
EOF

```

Instead of what’s between ‘EOF’ you would simply have your textfile … so something like :

```auto
gmt plot -R0/50/-50/50 -JX6i mygpsdata.txt -Sv0.15i+bc+ea -Gyellow -W0.5p -Baf -pdf map 

```