When I bought my first handheld marine GPS (a Garmin 12 in 2000), I thought, like many of us in fog-bound Maine, that I now had the ultimate answer to kayak and open-boat navigation. I regularly swapped it for newer handhelds as features were added or mine broke. Then last summer I heard about Maptattoo, a promising new chartplotter specifically created for small boats. It was being crowd-funded and I sent in a deposit to reserve one.The Maptattoo was designed to address the difficulties its developers encountered using a tablet in the 2018 Race to Alaska (R2AK). The first issue was visibility. If you’ve used a dedicated handheld tablet or smartphone to navigate, you know how frustrating it is to read an LCD screen in bright sunlight. Reflections make it difficult enough; with dark glasses it’s almost impossible. Power management is a challenge, with LCD screens needing plenty of power when running at full brightness. Batteries require replacing or charging, and on small, often wet boats this can be a problem. Handhelds that run 19 hours or so on a couple of AA batteries are fine for a day’s outing, but beyond that, the batteries need to be replaced or recharged. Despite manufacturers’ claims of watertightness, their handhelds’ battery boxes eventually fail, as my numerous dead handheld GPS units can attest, even when I’ve operated them in windowed dry bags, which also worsened visibility.The Maptattoo developers had several goals: a large screen with visibility even in bright sunlight, a multi-day battery, watertightness, impact resistance, and the ability to be operated with a wet finger or push-buttons. For readability and low-power consumption they settled on the only technology that provides both: E Ink, the black-and-white screen technology used for e-readers like Kindle.

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