CalTopo Premium Subscription vs Garmin GPSMAP 66i
Weight and specs compared for 2026 — and which one to choose.
Digital topo mapping service. Plan routes and download offline maps.
Full details →Robust handheld GPS with inReach satellite communicator for two-way messaging. Preloaded topographic maps with 100-hour battery life.
Full details →HikeLoad is reader-supported. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Learn more.
CalTopo Premium Subscription vs Garmin GPSMAP 66i: which should you buy?
If saving weight is your priority, the CalTopo Premium Subscription wins — at 0 g it is 230 g (100%) lighter than the Garmin GPSMAP 66i (230 g). That said, the heavier option may justify the extra grams with more capacity, durability or comfort, so weigh the trade-off against how you'll use it.
See where both rank against everything else in this category on the lightest navigation page, or browse the full gear weight database.