Introduction Recently I read several posts on various amateur radio forums regarding the reception of Shortwave Radiogram broadcasts. VOA Radiogram was a Voice of America program that experimented with various digital transmission modes, starting in March 2013. It was superseded by Shortwave Radiogram (Ref.1). I decided I would try reception using the very popular RTL-SDR […]
Introduction In previous posts we examined how to install OpenPlotter (Ref.1), how to connect a GPS receiver (Ref.2), how to connect AIS (Ref.3), and how to receive VHF (Ref.4). In this post we will examine how to connect & detect a sensor module such as the GY-91 which is referenced in OpenPlotter documentation. This module […]
Introduction Recently I have been working with various sensors such as a magnetometer, gyroscope and accelerometer for use in navigational systems (Ref.1). All these sensors are accessed using the I2C protocol. Over the past several years I have worked with various HF synthesizers that were also programmed via I2C. I used a Tektronix TDS210 digital […]
Introduction Since ancient times sailors have used the Earth’s magnetic field for navigation. The compass has its origin in China and was introduced into Western Europe from the Islamic world (Ref.1). My first compass exposure was orienteering on canoe trips in Norther Quebec and then later on a mineral magnetic survey in the Coppermine Area […]
Introduction In a previous post (Ref.1) I described how I developed an interest in Celestial Navigation and in my last posts (Ref.2, Ref.3) I explained what I believe to be the important points such as why CelNav is still relevant, the GP Geographic Position, the Navigation Triangle and it’s Trigonometric solution. In this post I […]