Tag Archives: Navigation

Real life Mayday & Mayday Relay

Posted on May 2, 2022 by swdevperestroika

Below clip contains a real Mayday call (starting 7:33) from passenger boat Cinderella II taking in water in Öresund.

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SAR Victor Sierra Search Pattern

Posted on January 23, 2022 by swdevperestroika

A while a go I posted a link to a Smarter Everyday video where Destin visits the US Coast Guard to learn about their operations. In particular, they executed a Victor Sierra pattern. Below two plots showing sea stabilized vs … Continue reading →

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SAR – Search Patterns

Posted on January 18, 2022 by swdevperestroika
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Quick & Dirty GPS Accuracy Test

Posted on April 17, 2021 by swdevperestroika

Today, when taking one of my daily walks, I encountered a young couple who had allocated this day to break some kind of record : they were to run up and down a small “hill” in the neighborhood, 100 times, … Continue reading →

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Sailors Ahoy ! – Rope around a bollard – Capstan Equation

Posted on March 19, 2021 by swdevperestroika

Ever tried to hold a rope that is pulled by someone or something, like a sail, a boat or a hanging weight…? If holding a pulling rope is something you’ve done a lot, you’ve surely soon figured out that if … Continue reading →

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Safeheaven Marine – Thunder Child II

Posted on August 5, 2020 by swdevperestroika
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Calculating distance from Lat & Lon coordinates using Python & Pandas

Posted on February 2, 2019 by swdevperestroika

Given a GPS log file structured as follows (column separators omitted for clarity): Speed Latitud Longitud Time 2019-01-07 06:15:27 0 59.649582 17.721365 2019-01-07 06:16:28 0 59.649583 17.721372 2019-01-07 06:17:28 0 59.649583 17.721370 2019-01-07 06:18:28 0 59.649583 17.721372 2019-01-07 06:19:29 0 … Continue reading →

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Parsing NMEA 0183 sentences in Python

Posted on June 8, 2018 by swdevperestroika

My skipper has recently bought an NMEA wifi gateway, which means that the NMEA messages from the various onboard instruments on his yacht are broadcasted on the yacht’s wifi network. This makes it very easy to grab the NMEA messages, … Continue reading →

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Map Projections using Python & Basemap

Posted on October 8, 2017 by swdevperestroika

The numerous external libraries available for Python continue impressing me, in scope, numbers and ease of use.  A couple of hours ago I googled for chartographic tools for Python, and found the Basemap-library, an add-on to Matplotlib. For whatever reason, … Continue reading →

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Great Circle Navigation

Posted on September 28, 2017 by swdevperestroika

The shortest distance between two points is a straight line, right…? Nope, not on the surface of a sphere, like our earth. On a sphere, the shortest distance between two points is a Great Circle.  Let’s say you are a … Continue reading →

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