diff --git a/pics/beidou.png b/pics/beidou.png new file mode 100644 index 0000000..30c1272 Binary files /dev/null and b/pics/beidou.png differ diff --git a/pics/galileo.png b/pics/galileo.png new file mode 100644 index 0000000..d5d0375 Binary files /dev/null and b/pics/galileo.png differ diff --git a/pics/glonass.png b/pics/glonass.png new file mode 100644 index 0000000..22e18df Binary files /dev/null and b/pics/glonass.png differ diff --git a/pics/gnss.png b/pics/gnss.png new file mode 100644 index 0000000..d0638f3 Binary files /dev/null and b/pics/gnss.png differ diff --git a/pics/gps.png b/pics/gps.png new file mode 100644 index 0000000..c153931 Binary files /dev/null and b/pics/gps.png differ