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Description
COROS APEX 4 (42 mm) GPS-horloge, 1,2-inch MIP-touchscreen, wereldwijde kaarten met stapsgewijze navigatie, batterijduur van 34 dagen, microfoon voor het opnemen van spraakmemo's, realtime weer - WitALPINE GRADE ENGINEERING+IN PLAIN SIGHT LICHTGEWICHT TITANIUM. VERSTERKTE LUGS. TOUCHSCREEN SAFFIERDISPLAY. APEX 4 (42 mm) combineert een 1,2 inch helder, altijd ingeschakeld display met pixelgeheugen en krasbestendig saffierglas. Lange batterijduur VOOR UW LANGSTE DAGEN: Lang genoeg om 100 mijl rond de Mont Blanc af te leggen of de Grand Traverse te voltooien. Met maximaal 41 uur All Systems GPS (APEX 4 42 mm) kunt u volledig vertrouwen op uw
- ALPINE-GRADE ENGINEERING+IN PLAIN SIGHT ：LICHTGEWICHT TITANIUM. VERSTERKTE LUGS. TOUCHSCREEN SAFFIERDISPLAY. APEX 4 (42 mm) combineert een 1,2 inch helder, altijd ingeschakeld display met pixelgeheugen en krasbestendig saffierglas.
- Lange batterijduur - VOOR UW LANGSTE DAGEN: Lang genoeg om 100 mijl rond de Mont Blanc af te leggen of de Grand Traverse te voltooien. Met maximaal 41 uur All Systems GPS (APEX 4 42 mm) kunt u volledig vertrouwen op uw horloge, of u nu de Grand Traverse voltooit of de volledige ronde rond de Mont Blanc aflegt.
- MESSCHERPE NAUWKEURIGHEID, ZONDER BEPERKINGEN: Alle systemen GPS + Dual-frequency GPS met verticale algoritmen, ontwikkeld voor uitdagende omgevingen in dichte bossen, steile couloirs, alpien terrein en steile wanden.
- 30x snellere kaart- en grafische weergavesnelheden: topografische en landschapskaarten, met namen van paden en straten, plus stapsgewijze satellietkaarten en hydrografische kaarten geven je de informatie die je nodig hebt wanneer je die nodig hebt, zelfs zonder mobiele service. Twee kaartlagen met 15 m zoom plus namen van paden en straten houden je georiënteerd op paden, in de stad of op de hellingen.
- Microfoon + luidspreker: neem Voice Pins op om beta op de muur vast te leggen of sla een notitie voor jezelf op tijdens je lange run, zodat je de volgende keer beter voorbereid bent. Voer handsfree gesprekken en luister luid naar je activiteitsmeldingen.
- WAAR UITHOUDINGSVERMOGEN EN HOOGTE SAMENKOMEN: Activiteitenmodi en trainingstools ter ondersteuning van trailrunners, big wall-klimmers, backcountry-skiërs en meer. Wat je doet: Trailrunning, skitochten, alpine klimmen en steile verticale training.
COROS APEX4
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4.3 ★★★★★
Based on 12 reviews
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Product Reviews
★★★★★ 5
Engaging Read for Beginners and Techies Alike
Format: Paperback
An engaging and accessible exploration of how computers really work. The author breaks down complex concepts into simple, relatable explanations, making topics like binary, logic gates, and basic circuits far less intimidating. For newcomers, it’s a great way to build a foundational understanding of computer theory with just a touch of electrical engineering.
As someone with a technical background, I still found it entertaining; the examples and analogies added fresh ways to frame ideas I already knew. It’s the kind of book that can bridge the gap between “I use computers” and “I understand what’s happening under the hood.”
Highly recommended for anyone curious about what makes hardware and software tick, whether you’re starting from scratch or just want a new perspective.
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Reviewed in the United States on August 19, 2025
★★★★★ 5
CODE is the book you should get.
Format: Paperback
The best book to enter the field. Grateful that Charles Petzold decided to write it, even happier this was one of the first books I picked up.
Recommend to everyone wanting to become a programmer, or just interested in computers.
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Reviewed in the United States on January 12, 2026
★★★★★ 5
If you only buy one technical computer book, this is it
Format: Paperback
Disclaimer: I owned the first edition for years and read it a dozen times, mainly for pleasure since it’s not only informative but also just enjoyable to read. I’m a professional software architect and have dozens of textbooks on computer science and engineering so I’ve been around the block.
This is the kind of book I would buy all for all my friends (if I had more than a couple) and family members (if they were even slightly into computers, which they aren’t sadly). Petzold does an exceptional job at describing digital logic and guides you through building a conceptual CPU from very first principles.
I think his bottom up approach is the way to go and has helped me understand complex topics in an extremely simple way. When I’m not reading fiction, this is my go to bedtime reading.
The second edition has about 100 more pages than the first and some content has been completely reworked and it’s great.
If you ever had even a passing interest in knowing how computers work at a very fundamental level, get this book!
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Reviewed in the United States on January 31, 2023
★★★★★ 4
First programmer?
Format: Paperback
As an ardent reader of the past 1st edition, I was fairly excited to get the latest version. That is, until I encountered the history chapter of the new edition.
For one thing, what I do NOT understand in this second edition is the newly added description of August Ada Byron (countless of Lovelace). The author claims it was Babbage who was the first programmer to design the engines, not Ada. I am not trying to start a futile argument here about who has more or fewer contributions, etc.
What I am trying to assert here is that it is undisputed that Ada (unless the new evidence arises) left *the very first demonstration* of what this seemingly imaginary machine, which didn't even physically exist, was capable of through her program. Because Babbage designed the engine itself, that doesn't automatically put him in the position of a programmer (despite Babbage being a brilliant engineer/scientist and may have had a simple or detailed program in his mind). However, it was Ada who gave a definite touch to programming concepts that ultimately led to modern-day programming. Ada deserves more recognition than a mere "tutorial writer," and she is certainly entitled to the title she deserves.
Other than that, like the previous edition, this book is a must-read for people who are from related/unrelated fields. I always loved the 1st edition, and I would do too with the 2nd. Still, I think history should always be approached with more care, particularly if matters have potential controversies.
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Reviewed in the United States on January 6, 2023
★★★★★ 5
One of the few books worth your time
Format: Paperback
If you want to learn computers, start here. Learning from a historical perspective removes complexity of trying to start with say GPUs - you learn just like computer engineers did, incrementally.
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Reviewed in the United States on April 27, 2026