Introduction Recently I revisited OpenPlotter after a two year interval to see what had changed in the latest version 3 (Ref.1). I tested the Starter and Headless images and setup AIS & GPS on OpenCPN. In 2021 I had looked at various aspects of version 2 (Ref.2/12). In this post I will look at the… Continue reading OpenPlotter3 – Sensors_a
Category: Navigation
Navigation: Celestial, Sextant, Equipment
GNU Radio Embedded Python Block for RaspberryPi4 GPIO
Introduction In many previous posts I have examined the use of the RTL-SDR with GNU Radio and on RaspberryPi4 (Ref.1/5). The combination makes an inexpensive, simple and rugged platform for the reception of a variety of signals. Figure 1 shows a typical implementation. The RTL-SDR is used to receive a Marine Weather signal at 162.4MHz… Continue reading GNU Radio Embedded Python Block for RaspberryPi4 GPIO
OpenPlotter3 Headless For GPS & RTL-SDR AIS on RPi4
Introduction Recently I was asked a question about AIS & OpenPlotter. I looked at various aspects of OpenPlotter2 several years ago (Ref.1/11) so I thought it would be a good idea to revisit the latest version3 of the Program. I downloaded RPi4_32bit images for Starter & Headless. Starter Image Setup I first downloaded the RPi4_32bit… Continue reading OpenPlotter3 Headless For GPS & RTL-SDR AIS on RPi4
Celestial Navigation – Spring Fix
Introduction Last week in Toronto the weather turned from Siberian winter to balmy spring. So I decided to head down to Harbourfront with my sextant and take some measurements. I have covered all the basics of CelNav in previous posts (Ref.1/9). Remember one bad solar X flare and we are back to slide rules &… Continue reading Celestial Navigation – Spring Fix
Splat! – Digital Elevation Data with QGIS
Introduction Splat! (Ref.1) is a very versatile propagation prediction program that I discussed in several previous posts. In my first post, I looked at installation on Windows and Linux, how to obtain the digital elevation data files, create QTH & LRP files, and run a simple point to point analysis (Ref.2). In the second and… Continue reading Splat! – Digital Elevation Data with QGIS