diff --git a/Automatic-dependent-surveillance–broadcast-(ADS-B).md b/Automatic-dependent-surveillance–broadcast-(ADS-B).md
index 09a2a49..17abb70 100644
--- a/Automatic-dependent-surveillance–broadcast-(ADS-B).md
+++ b/Automatic-dependent-surveillance–broadcast-(ADS-B).md
@@ -4,7 +4,7 @@ With this app you can receive real-time ADS-B used for air traffic control.
 Select a received aircraft and more detail will be shown. Select "Show on map" to see the aircraft location. ADS-B operates on 978 to 1090 MHz. Even a short antenna attached directly to the Portapack will receive ADS-B when the receive preamp is enabled ("1" displayed).
 
 ## Map
-For map functionality a world map must be loaded on the SD card. The map image and other SD card content is available from the portapack-mayhem github download page.  Beginning in firmware version 1.7.3, the map can be zoomed by moving the cursor down to the map region and turning the encoder dial (resolution is still limited by the map file, but this feature helps to separate overlapping plane icons).  The map position can also be changed by modifying the latitude and longitude values.
+For map functionality a world map must be loaded on the SD card. The map image and other SD card content is available from the portapack-mayhem github download page.  The map can be zoomed in or out by moving the cursor down to the map region and turning the encoder dial (resolution is still limited by the map file, but zooming in helps to separate overlapping plane icons, and zooming out may help if you have really good reception).  The map position can also be changed by modifying the latitude and longitude values.
 
 ## Airlines