1. APPLICATION: This is a professional multi-function on-board marine compass. It includes tools for compass deviation correction. The compass, with the power cord, can connect to vehicle or ship power to supply power for the lamp on the compass. 2. CONVENIENT LED COMPASS: The dial features bright LED for easy reading day or night. The power cord allows external connection to vehicle or ship power to power the lamp on the compass. 3. MATERIAL: Made of high-quality ABS plastic, impervious and environmentally friendly. 4. EASY TO INSTALL: Mounts easily to almost any flat exterior with the included EVA foam sticker or screws. Use scenarios: - Nighttime navigation on a small boat: LED-lit dial provides clear readings while you perform compass deviation corrections with the included tools. - Bridge operations on a larger vessel: Connect to ship power to keep the lamp illuminated for continuous visibility. - Maintenance and calibration: Use the included deviation-correction tools to ensure accurate readings.