FR510 Multifunctional GPS Altimeter Barometer Compass Thermometer Brand_Digital Antenna provides electrical insulation and helps

provides electrical insulation and helps prevent snagging

and closest point of approach on all user targets selected

1/2" NPS NPT Combo Bronze Thru-Hull Fitting with Nut

doesn't decay like wood pole racks

19 upper-arm angle/locking (@10 deg

FR510 Multifunctional GPS Altimeter Barometer Compass Thermometer Brand_Digital Antenna provides electrical insulation and helpsSPECIFICATIONS Item Type: GPS Multifunctional GPS Product Model: FR510 Material: ABS Power Supply: 1 x Lithium Ion Battery 230mAh(built in) Charging Voltage: DC 5V Height: Measuring Range: 700 to 9000 meter ( 2296 to 29500 ft) Accuracy: 1m ft Function: Maximum and minimum height records, 24 hours of historical height records have been plotted Height Gain and Loss Calculation Range: 44999m ft Function: Sea level height setting, height change warning,