Cammenga 3H

Published · Researched 2026-09-21

NSN: 6605-01-196-6971 | Mil-spec: MIL-PRF-10436N | Category: Military lensatic compass (tritium) | Lineup note: the official US military lensatic compass, made in the USA. The 3H is the current tritium model. Do not confuse with phosphorescent-lensatic knockoffs (no tritium, no NSN) or the older non-tritium M-1950 pattern.

Version lineage (2023–2026)

• Decades: Cammenga has supplied the US military lensatic compass for generations; the 3H is the long-standing tritium model.
• 2023–2026: 3H remains the current issue item; no successor — the design is frozen by mil-spec. Manufacture dates are stamped on the case (buyers report 2025 dates in 2026 retail stock).

Overview

The Cammenga 3H is the genuine US military lensatic compass: cast aluminum body, copper-induction damping (no liquid to freeze, bubble, or leak), seven tritium micro-lights that glow for 12+ years with no charging, −50°F to 150°F operating range, and ±40 mil accuracy. It shoots azimuths in total darkness, survives being run over, and asks nothing of you — except that you learn mils. The dial reads in both degrees and mils, but there's no declination adjustment: you do the math, like generations of soldiers did. Veterans buying their own after service call it "the real deal, exactly what we carried downrange." For civilian hikers it's overkill in the best way — and a poor map-plotting tool compared to a baseplate.

Key Specs

Pricing

• MSRP: ~$105 direct from manufacturer (reported by buyers).
• Street (observed 2026-09-20): $99.99–$131.75 at US retailers; buyers report ~$88–$105 historically.
• Ongoing cost: none — tritium needs no charging or batteries.

In the Box

3H compass, canvas/USGI-style carrying pouch with belt clip. (Verify pouch inclusion per retailer — UNVERIFIED in some listings.)

Warranty

Cammenga's warranty terms not confirmed in this pass — UNVERIFIED. (Note: tritium vials are regulated; warranty handling of the light source may have special terms.)

Support & Parts

• Cammenga (Michigan, USA) services its compasses.
• Buying authentic matters: fakes are common — check for the Cammenga logo, crisp NSN/serial stamping, consistent tritium glow, and buy from reputable dealers. Check the manufacture date code on the case (e.g., "20 03 77" = March 2020) — tritium dims over its 12+ year life, so newer stock is brighter.

Community Verdict

Veterans and land-nav practitioners revere it: "does what it's supposed to and I trust it more than my cheap plastic one." The tritium is the beloved feature — shoot azimuths in blackout conditions with no flashlight, no night-vision compromise. The criticisms are consistent and fair: it's heavy for a compass, the dial is mils-first (civilians must convert), there's no declination adjustment, no protractor/romer scales for USGS topos, and induction damping settles slower than a good liquid capsule (~6 seconds vs <1 for a Suunto). SAR teams and nav schools rarely use it — it's a military instrument, not a hiking instrument. Buy it because you want the toughest compass ever made, not the most convenient.

Images

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Research date: 2026-09-20. Specs cross-verified across Cammenga published data, mil-spec references, and retailer listings; pricing observed 2026-09-20. Re-verify live: current street price and warranty terms.

Long-term durability & warranty-claim reality (enrichment — Sept 2026)

This is the durability benchmark everything else is measured against: aluminum housing, no liquid, no batteries, tritium rated 12+ years minimum per mil-spec. Units from the 2000s are still in service. The realistic lifespan limiter is tritium decay — after ~12 years the glow fades (half-life ~12.3 years), and the compass still works fine in daylight. There is no meaningful warranty-claim culture around the 3H because there's almost nothing to fail.

Version history — year by year (enrichment — Sept 2026)

• The 3H design is effectively frozen by MIL-PRF-10436N — "versions" are manufacture dates, not model years. Buyers in 2026 report late-2025 manufacture dates in retail stock, which is what you want for maximum tritium life.

Head-to-head vs closest rivals (enrichment — Sept 2026)

• brunton-truarc-20: mirror-sighting precision with declination adjustment — the better map-and-compass tool. Choose Brunton for hiking navigation; choose Cammenga for indestructibility and night use.
• silva-ranger-2-0: lighter, cheaper, better for topo work. Choose Silva for the trail; choose Cammenga for the apocalypse.
• suunto-mc-2: existing catalog — global needle, fast-settling liquid capsule. Choose Suunto for speed and precision; choose Cammenga for darkness and durability.

Care & maintenance (enrichment — Sept 2026)

• When closed, the needle lifts off its pivot — store closed to protect the mechanism.
• No batteries, no charging, no liquid — maintenance is essentially "don't lose it."
• Wipe grit from the hinge; a drop of dry lube if the cover stiffens.
• Do not disassemble the tritium vials. Tritium is a regulated radioactive material — the sealed vials are safe; broken ones are a hazmat and legal problem.

Buying traps (enrichment — Sept 2026)

• Fakes are rampant: no NSN, blurry markings, weak/inconsistent glow, wrong logo = counterfeit. Buy from reputable dealers.
• Check the manufacture date code — a "new" compass made in 2012 has half its tritium life gone.
• The bezel is plastic on some production runs (buyers note it) — that's normal, not a defect.
• Ignore retailer accuracy claims like "±0002 mils" — the mil-spec figure is ±40 mils.

Community Verdict — additional voices (enrichment — Sept 2026)

• A Trailspace reviewer with a physics bent notes the induction damping settles in ~6 seconds vs <1 second for a liquid Suunto — measurable, and irrelevant to most users.
• Land-nav instructors: "learn on the Cammenga and every other compass feels like a toy — but learn map work on a baseplate first."
• The standard advice for civilians: if you don't know what a mil is, you don't need this compass yet — and that's fine.

Key Specs gap-fill (enrichment — Sept 2026)

• Weight: not captured from an official spec table in this pass — UNVERIFIED (it's "heavy for a compass" per owners; roughly 12 oz class with pouch per anecdotal reports — UNVERIFIED).
• Warranty terms: not confirmed — UNVERIFIED.
• Pouch inclusion: standard per most listings — UNVERIFIED per-retailer.