Digital GPS speedometer for marine boat with TFT screen: Speed over the ground. TRIP: Single mileage, reset after power failure. ODO: Accumulated mileage, save when power off. COG: heading, clockwise angle of<br> Battery voltage: 9-32V<br> Navigation pointer: 8 directions.<br> Can freely switch kont, mph, km/h speed unit<br> Tips:The picture is a high-definition rendering. The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use.<br> GPS speedometer:<br> 1. Connect the device as picture E, the GPS speedometer will start to search GPS signal when power on. Generally, the GPS signal will be reached within 300 seconds, and the digital will display as counting (from 1 to 300) , also the words(GPS...) will be flickering as well, until the GPS signal was found, the sympol(GPS) will be lighting as normal. There will be an Error code "E02" if the GPS input was not be found within 300 seconds.<br> Note:(1) Trip: Total mileage of a working cycle (data will be cleared after power off) (2) ODO: Total mileage of driving (data will be recorded)<br> 2. Operation:<br> a, Keep pressing the Mode button for 4 seconds to entry setting ODO data, the data will increasing as you keep pressing , also , the data will be decreasing if you release and press again. Data will be recorded if release for more than 3 seconds.<br> b, Quick press the Mode button to switch the speed unit to / MPH / Knots3<br> 3. Error code:<br> E01: No GPS signal was found after start working<br> E02: GPS signal was lost during working<br> E03: Device failed<br> Working environment:<br> Working voltage:9-32VDC<br> Working current:Less than 120mA<br> Working temperature:-20-70<br> Storage temperature:-30-80<br> Waterproof rating:IP67<br> Input parameters:GPS signal<br> Colour:Black & Silver<br> Material:Stainless steel<br> Package Contents:<br> 1 * GPS digital speedometer<br> Only the above package content, other products are not included.<br> Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.