SEAiq Pilot : Open version with advanced functions for coastal, harbour and river pilots ($200).We can test this version for free for a week (can reinstall repeatedly) before unlocking the Premium option by purchasing in-app (18 €). SEAiq Open : the standard version supporting ENC charts already mentioned, Inland ENC, CM93, raster charts BSB / KAP (MapTech) and with all the premium features.Free SEAiq can test SEAiq USA version before buying, and unlock all features through purchase in-app (9 €). SEAiq USA and SEAiq Free : reserved for American boaters can automatically download the RNC and ENC charts from NOAA ( ²) that, it bears repeating, are universally free.With information database included in these charts, and update systems, SEAiq transforms the iPad into a true ECDIS ( ²) professionnal. ![]() SEAiq Open ( ¹) is the only application on iPad / iPhone for using vector charts ENC IHO official standards S-52, S-57 and S-63. Its developer, Mark Hayden, is a Californian computer engineer living a good part of his time with his family or alone around the world aboard his Super Maramu, happy man. SEAiq was posted on the AppStore in April 2012. ![]() I sincerely thank him ! As it is never too late to do, some exchanges with the developer helped me install this application on my iPad with all its options. of units of bits (and it needs to send more than the files themselves, so some overhead needs to be factored in), making superficially similar terms very incompatible.A few days before going on a long trip from Toulon to Noumea, My friend Christophe Mahé introduced me to this application that I had gone unnoticed. MB/s) in binary rather than metric system, while networking hardware, such as WiFi, always uses the metric system (Mbit/s, Gbit/s etc.). "downloads") may use rates of units of bytes (e.g. Sometimes kB, with lower cased SI-prefix 'k-' for kilo (1000), is used, then always equaling 1000 bytes.įile transfers (e.g. Kilobyte (KB) (JEDEC), is sometimes referred to unambiguously as kibibyte (KiB)(IEC). 'KB', while hard disk manufacturers use the metric system (for e.g. Command line tools can also expose the exact byte size as well.Ī file system may display all sizes with the metric system with only 'kB' on small files indicating it, while some file systems/operating systems would display sizes in, the traditionally used on computers, binary system for all sizes, e.g. While these larger units are not as accurate as the byte size, most operating systems will expose the true byte size of a file by inspecting the file properties directly. Larger files will typically have their sizes expressed using kilobyte, megabyte or gigabyte depending upon how large the file is. Although smaller sector sizes allow for denser use of disk space, they decrease the operational efficiency of the file system.įurther information: Units of informationīytes are the typical base unit of information. The size of a disk sector ranges from several hundred to several thousand bytes.) The unused space is called slack space or internal fragmentation. (A sector is the smallest amount of space addressable by the file system. This is because the file system rounds the size up to include any unused space left over in the last disk sector used by the file. When a file is written to a file system, which is the case in most modern devices, it may consume slightly more disk space than the file requires. ![]() By convention, file size units use either a metric prefix (as in megabyte and gigabyte) or a binary prefix (as in mebibyte and gibibyte). Typically, file size is expressed in units of measurement based on the byte. File size is a measure of how much data a computer file contains or, alternately, how much storage it consumes.
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