Introduction In previous posts I looked at OpenPlotter2, then recently OpenPlotter3 (Ref.1/6). I looked at various aspects including GPS, AIS, WeFax, Navtex and Sensors. In this post I will look at OpenPlotter4 on RPi4 with AIS, GNSS and Sensors. Installation Figure 2 shows the OPV4 starter image which I downloaded from Ref.7. Then I used… Continue reading OpenPlotter4 on RPi4 – AIS/GNSS/Sensors
Magnetic Anomaly Detection
Introduction In a previous post I reviewed magnetic navigation and my personal experience using various compasses and magnetometers (Ref.1). In this post I will examine a different magnetometer the Melexis MLX90393. Recent aerial activity of anomalous vehicles suggests that having a method to measure magnetic fields is important. These craft cause all electrical activity to… Continue reading Magnetic Anomaly Detection
Data Integrity – CRC/SHA
Introduction Recently I went to a Blockchain conference to get some understanding of cryptocurrency which I am totally ignorant of. I came across the concept of “hashes” which are sent from one block to another in order to indicate the integrity of the data sent. It reminded me of the CRC16/32 used in data transmission… Continue reading Data Integrity – CRC/SHA
GNSS & AIScatcher on RaspberryPi4
Introduction In the previous post I looked at using AIScatcher along with GNSS to plot position and AIS contacts on OpenCPN (Ref.1). AIScatcher is very sensitive and I even managed to pick us contacts at my home location which is surrounded by massive steel condos and is distant from the harbour. In this post I… Continue reading GNSS & AIScatcher on RaspberryPi4
GNSS & AIScatcher on OpenCPN
Introduction In recent posts I have been looking at using my new GNSS receiver on various maps such as OpenStreetMap and OpenCPN (Ref.1/4). Yesterday I received an email from a colleague who told me about AIS Catcher, a new multi-platform AIS software (Ref.5). I downloaded it and tested it from my home QTH. Tech Minds… Continue reading GNSS & AIScatcher on OpenCPN