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Garmin GPSMAP 66i vs Garmin Montana 700i

Weight and specs compared for 2026 — and which one to choose.

Garmin GPSMAP 66i is the lighter option — 160 g lighter than the Garmin Montana 700i (41% less weight). If grams matter to you, that is the one to beat.
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Spec Garmin GPSMAP 66i Garmin Montana 700i
Weight 230 g · 0.230 kg · 0.51 lb 390 g · 0.390 kg · 0.86 lb
Brand Garmin Garmin
Category Navigation Navigation
Garmin GPSMAP 66i
230 g

Robust handheld GPS with inReach satellite communicator for two-way messaging. Preloaded topographic maps with 100-hour battery life.

See it in your base weight → Full details →
Garmin Montana 700i
390 g

Ruggedised GPS with large touchscreen and inReach satellite.

See it in your base weight → Full details →

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Garmin GPSMAP 66i vs Garmin Montana 700i: which should you buy?

If saving weight is your priority, the Garmin GPSMAP 66i wins — at 230 g it is 160 g (41%) lighter than the Garmin Montana 700i (390 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.

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