GPS Map Ruler can help you measure distance & area. GPS Map Ruler Important features:1. Measure distance on the map2. Measure area3. 2 themes (Azure & Pink)4. Supports multiple length units (Meter, Kilometer, Mile, Inch, Foot, Yard)5. Supports multiple area units (Square meter, Square kilometer, Square mile, Square Inch, Square Foot, Square Yard, Hectare, Acre)6. Supports multiple map types (Standard, Satellite, Mix Mode)7. GPS Map Ruler is free now!How to use GPS Map Ruler?1. Tap the mid-bottom button to switch between distance & area2. Tap the right-bottom button to undo, long press undo button to clear all point on the map.3. Tap the right-top button to move to your current location.If you have any questions about using GPS Map Ruler, please e-mail us.Thanks.