Introduction In a recent post I looked at adapting an artificial bubble horizon to my sextant using a 3D printed bracket. I calibrated the combination with a water horizon on Lake Ontario (Ref.1). In this post I look at taking measurements of the Moon altitude on Sept12th & Oct5th using the artificial horizon from my… Continue reading Celestial Navigation – Artificial Horizon_b
Category: Navigation
Navigation: Celestial, Sextant, Equipment
Celestial Navigation – Artificial Horizon_a
Introduction The addition of an artificial horizon to a Marine Sextant allows measurements to be taken when you don’t have a water horizon nearby. I purchased an Artificial Bubble Horizon and adapted it to fit on my existing Sextant. The mounting slot on the Horizon was the mirror image to the slot on my Sextant,… Continue reading Celestial Navigation – Artificial Horizon_a
AIS & GNSS on OpenCPN
Introduction In previous posts (Ref.1/3) I looked at using a new GNSS receiver with AIS on various combinations of Win10/RPi4/OpenStreetMap/OpenCPN. In this post I look at GNSS on full receive 921600bps with AIScatcher. Equipment Block Diagram Figure 1 shows the receive block diagram. To receive all 4 satellite constellations you have to have the maximum… Continue reading AIS & GNSS on OpenCPN
HF Marine Weather 8764KHz_USB
Introduction Further to my previous post (Ref.1), I was hoping to receive a DRM transmission on the 31m band at 1900DST/2300UTC. I used the same equipment: SDR-IQ with HF Loop antenna tuned for 9.5MHz. There were several very powerful signals but no DRM. I did receive a strong USB signal on 8764KHz which turned out… Continue reading HF Marine Weather 8764KHz_USB
RTL-SDR for NOAA15/18/19 Satellite Weather-Summer 2025
Introduction Several years ago, I looked at receiving NOAA15/18/19 satellite weather using various configurations with a Windows 10 laptop and a Raspberry Pi4B (Ref.1/5). I also simulated the NOAA-APT transmission using Scicos (Ref.6). I thought it would interesting to revisit NOAA and try some different ideas I picked up working with Cubesats. Satellite Tracking Figure… Continue reading RTL-SDR for NOAA15/18/19 Satellite Weather-Summer 2025