does this compass have adjustment for declination?

It does not have PRESET declination - the mechanism in some compasses allowing you to preset the compass for local declination so that the compass always gives bearings as they relate to true north. Instead, each time you take a magnetic bearing on this compass, you must adjust the compass dial, manually adding or subtracting the local declination to get a true north bearing. Vice versa when you take a true bearing from the map and convert it to a magnetic compass bearing.

Does this have to be near horizontal for the arrow to float freely, or can it be tilted up, say 45 degrees and work?

NO handheld compass can be tilted at 45 degrees to the horizontal and still give accurate readings. Like any compass that rests on a central pivot, you have to hold the compass horizontal to just a few degrees or frictional contact will give erroneous readings - or even stick the dial against the bottom of the compass well. It's not hard to do.

Would this still work if you left it on the dashboard of your vehicle?

As noted by others this is a *magnetic* compass so it aligns it's own magnetic field with the net magnetic field wherever it is located. Any Iron or steel (excluding certain types of stainless steel) will warp the nearby magnetic fields (both the earth's field and the field emitted by the compass needle will be affected). Devices like this are designed to be used in the woods by a boy scout who is not wearing an iron belt buckle. The suitability of any other electromagnetic environment needs to be confirmed if you want reliable readings. Devices placed in cars have to be designed and placed carefully because cars have lots of steel. Below you will find a hilarious photo of a compass next to a phone and the magnetic needle is pointing at the phone instead of north (which has lots of electric fields and possibly magnetic materials, I just tested with my pone and it definitely deflects the needle when the phone is close) The guy posting the photo clearly has no idea that the photo proves his ignorance rather than the malfunction of the compass. Sadly he's given the product a poor rating it doesn't deserve.

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🧭 Own the Outdoors: Navigate with Confidence, Day or Night!

NAVIGATE LIKE A PRO - Rotating housing with memory arrow locks your direction for flawless trail tracking.
LIGHTWEIGHT READY TO GO - Compact design with lanyard and beginner-friendly instructions—adventure starts here.
MAP READING MADE EFFORTLESS - Integrated magnifier and orienteering lines bring fine map details into sharp focus.
NEVER LOSE YOUR WAY AT NIGHT - Liquid-dampened needle glows in the dark, ensuring reliable readings after sunset.
VERSATILE SCALES FOR EVERY TRAIL - Includes 1:25,000, 1:50,000, and millimeter scales to master any terrain.

Coghlan’s Outdoor Compasses combine precision engineering with user-friendly features like a rotating memory arrow, luminous liquid-dampened needle, and a magnifier-equipped clear base. Designed for hikers, campers, and survivalists, these lightweight compasses include versatile mapping scales and come with a lanyard and instructions, making them the ultimate navigation tool for any outdoor adventure.

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UPC	758399396449 056389096851 824365001980
Global Trade Identification Number	00056389096851
Manufacturer	Coghlan's
Item Package Dimensions L x W x H	6.77 x 2.52 x 0.75 inches
Package Weight	0.06 Kilograms
Item Dimensions LxWxH	1 x 1 x 1 inches
Brand Name	Coghlan's
Country of Origin	Taiwan
Warranty Description	1 Year Manufacturer
Model Name	Compass
Color	Multi
Suggested Users	unisex-adult
Number of Items	1
Part Number	9685
Model Year	2013
Style	Deluxe Map Compass
Included Components	Deluxe Map Compass
Size	One Size

Coghlan’s Outdoor Compasses – Lightweight, Durable Navigation Tools for Hiking, Camping, Orienteering & Survival with Map, Wrist, Lensatic, LED, and Carabiner Options

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