{"product_id":"silva-expedition-4-rotatable-navigation-compass-1-25k-1-50k","title":"Silva Expedition 4 Rotatable Navigation Compass 1:25k\/1:50k","description":"\u003cp\u003e\u003cstrong\u003eThe Silva Expedition 4 is a full-size, rotatable baseplate compass engineered for advanced navigation with 1:25k, 1:40k and 1:50k map scales, durable construction and night-visible markings.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eBuilt for mountaineers, search-and-rescue teams and serious backcountry navigators, the Expedition 4 combines a large, easy-to-read capsule with map-measuring scales, a magnifier and silicon friction feet so you can plot courses accurately in demanding conditions. It integrates declination adjustment, a sapphire jewel bearing for steady needle action and luminous elements for limited night use—everything needed when precision matters more than convenience.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the Expedition 4 help me plot accurate map bearings?\u003c\/h3\u003e\n\u003cp\u003eThe rotatable housing and clear baseplate let you align the compass to grid north and read bearings directly against standard topographic maps. Internal declination adjustment allows you to correct for magnetic variation without estimating, and the printed 1:25k, 1:40k and 1:50k scales speed up distance measuring.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRotatable capsule for direct bearing transfer from map to terrain\u003c\/li\u003e\n  \u003cli\u003eBuilt-in declination adjustment for precise true-north readings\u003c\/li\u003e\n  \u003cli\u003eMap scales in mm and inches for 1:25k, 1:40k, 1:50k maps\u003c\/li\u003e\n  \u003cli\u003eSilicon rubber feet keep the baseplate steady during plotting\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat features make this compass durable and reliable outdoors?\u003c\/h3\u003e\n\u003cp\u003eThe Expedition 4 is engineered with rugged materials and a sapphire jewel bearing that minimizes friction and keeps the needle stable after shocks. A detachable lanyard and robust housing protect the instrument in packs or on harnesses, while the liquid-damped capsule reduces needle wobble for quicker, more confident readings.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSapphire jewel bearing for long-term needle stability\u003c\/li\u003e\n  \u003cli\u003eRobust housing and detachable lanyard for secure carry\u003c\/li\u003e\n  \u003cli\u003eLiquid-damped capsule for fast needle settlement\u003c\/li\u003e\n  \u003cli\u003eNight-luminous markings for limited low-light navigation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCan I use the Expedition 4 for night and low-visibility navigation?\u003c\/h3\u003e\n\u003cp\u003eYes—selected markings on the dial are luminous after exposure to light, providing several hours of visibility for twilight or short nighttime legs. The large, clear capsule and magnifying lens also help identify gridlines and map details when light is poor, though it’s best used alongside a headlamp for long overnight routes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eLuminous dial markings that glow after light activation\u003c\/li\u003e\n  \u003cli\u003eLarge magnifying lens for reading map detail in low light\u003c\/li\u003e\n  \u003cli\u003eHigh-contrast red\/black north-south lines for fast orientation\u003c\/li\u003e\n  \u003cli\u003eWorks best paired with a headlamp for extended night use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the Expedition 4 fit into advanced navigation systems?\u003c\/h3\u003e\n\u003cp\u003eThe compass is compatible with Silva’s established navigation principles and can be used with grid-and-magnetic conversion techniques required for professional tasks. Its readable scales, rotatable housing and reliable needle performance make it suitable for training, detailed route planning and coordinated field operations.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with standard grid-to-magnetic navigation workflows\u003c\/li\u003e\n  \u003cli\u003eClear baseplate and scales for distance and bearing calculations\u003c\/li\u003e\n  \u003cli\u003ePatented red\/black orientation lines to simplify map alignment\u003c\/li\u003e\n  \u003cli\u003eSized for glove-friendly use without sacrificing precision\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? The Silva Expedition 4 is aimed at experienced outdoor professionals and committed adventurers who need a dependable, feature-rich compass for complex navigation. If you lead multi-day routes, perform search-and-rescue tasks, instruct navigation courses or simply demand trustworthy map-and-compass performance in harsh conditions, the Expedition 4 delivers the tools and durability to get you where you need to go.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the Expedition 4 allow for declination adjustment?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It includes an internal declination adjustment so you can correct magnetic bearings to true north.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How long do the luminous markings remain visible?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: After charging in daylight or a light source, markings remain visible for several hours, suitable for short night use.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Silva","offers":[{"title":"Default Title","offer_id":48413417537693,"sku":"B000KMFR6A","price":56.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0766\/9596\/1757\/files\/silva-expedition4-front-packaging.jpg?v=1781264512","url":"https:\/\/nexoltic.com\/products\/silva-expedition-4-rotatable-navigation-compass-1-25k-1-50k","provider":"Nexoltic","version":"1.0","type":"link"}