## Single-Action Function Buttons

Functions that require no more than one action from the navigator.

The single-action function buttons are located on the left side of the ECDIS screen and provide quick access to the most frequently used functions.

| Button | Action |
|--------|----------|
| {{ btn_center_ship }} | Center on ship position |
| {{ btn_center_on }} {{ btn_center_off  }} | Enable/disable ship position lock to screen center |
| {{ btn_motion_mode_tm }} {{ btn_motion_mode_rm }} | {doc}`Motion mode </sections/enc-collection-management/enc-display-settings/index>` |
| {{ btn_map_orientation_north }} {{ btn_map_orientation_course }} {{ btn_map_orientation_heading }} {{ btn_map_orientation_route }} | {doc}`Chart orientation </sections/enc-collection-management/enc-display-settings/index>` |
| {{ btn_master_mode }} {{ btn_backup_mode }} | Switch {doc}`**Master**/**Backup** </sections/bridge-mode/index>` |
| {{ btn_info_symbol }} | Enable Info symbol |
| {{ btn_anchor_watch }} | {doc}`Anchor Watch </sections/instruments/anchor-watch/index>` |
| {{ btn_quick_settings }} | {doc}`Operational Settings </sections/graphical-user-interface/operational-settings/index>` |
| {{ btn_DR }} | Go to {doc}`Dead Reckoning </sections/instruments/route-calculation/index>` tool |
| {{ btn_POB_off }} {{ btn_POB }} | {doc}`Man Overboard </sections/instruments/man-overboard/index>` |
| {{ btn_quick_mark }} | Event mark |
| {{ btn_Help }} | Open electronic help |
| {{ btn_standard_display }} | Enable standard display |
| {{ btn_accuracy_symbol }} | Enable CATZOC symbol |
| {{ btn_target_suppression }} | Target suppression |
| {{ btn_river_mode }} {{ btn_sea_mode }} | Switch **River**/**Sea** mode |
| {{ menu }} | {doc}`Main Menu </sections/graphical-user-interface/main-menu/index>` |
