Zoom profile help

Type: "[startDistanceInKM] [endDistanceInKM]".
An empty startDistanceInKM means start (km 0);
an empty endDistanceInKM means track length
Clear textbox in order to restore full profile range

Examples:

• "10 20" zoom profile from km 10 to km 20
• " 20" zoom profile from km 0 to km 20
• "20 " zoom profile from km 20 to the track length
• "" restore full profile range