Uniden SM81 Speaker Microphone [SM81] Brand_Fortress Marine Anchors It also features an automatic

It also features an automatic calibration routine to compensate for the effects of nearby magnetic influences

or by helping them clear obstructions that would otherwise interfere with proper radiation

Reads in Feet

All compasses come standard with 12v lighting

Uniden SM81 Speaker Microphone [SM81] Brand_Fortress Marine Anchors It also features an automaticSM81 Speaker Microphone Uniden's SM81 Marine VHF Speaker Microphone replaces Uniden's HHSPM. WARNING: This product can expose you to chemicals including LEAD which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings. ca. gov. Specifications: Type: Microphones Box Dimensions: 2"H x 4"W x 4"L WT: 0. 32 lbs Quick Guide (pdf)