Category: Navigation

Navigation: Celestial, Sextant, Equipment

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

RTL-SDR for Marine GMDSS/DSC on RaspberryPi4

Introduction In my last post I looked at using the RTL-SDR for receiving Marine GMDSS/DSC signals on HF/VHF (Ref.1). Reception was done using Multipsk on Windows 10. In this post I examine using the RTL-SDR as a stand alone Marine VHF DSC receiver operating on the RaspberryPi4B. The RaspberryPi4B is configured for remote operation off… Continue reading RTL-SDR for Marine GMDSS/DSC on RaspberryPi4

RTL-SDR for Marine GMDSS/DSC on MULTIPSK

Introduction Recently I received an interesting question from Scott in Vancouver about Marine Channel 70 and DSC Digital Selective Calling. DSC is a part of the GMDSS Global Maritime Distress and Safety System (Ref.1/2). It can be used by ships on the MF/HF bands or in the VHF band. The ship MMSI identifier can be… Continue reading RTL-SDR for Marine GMDSS/DSC on MULTIPSK