I had to connect the Simrad AP-50 auto pilot to Arneson Surface Drive on the new building Italcraft 105.

As per Simrad (Robertson) specs the rudder feedback converts the rudder angle to a variable frequency of 3000 to 3800 Hz and it is calibrated to span the full range.

Usually Arneson provides an output 0 to 5V.

Before you start looking for convertion of Voltage to Frequency, ask the supplier of Arneson or the shipyard if the VHVT Cylinder Interface is available on board.

This interface has an output of 3000 to 3800 Hz on the AutoPilot output (Section A) Pins 2 and 3

Note that the rudder feedback indication is available only after starting engines.
ITU-R Recommendation M.1371-1 describes the following types of AIS:

Class A
Shipborne mobile equipment intended for vessels meeting the requirements of IMO AIS carriage requirement.

Class B
Shipborne mobile equipment provides facilities not necessarily in full accord with IMO AIS carriage requirements. The Class B is nearly identical to the Class A, except the Class B:

  • Has a reporting rate less than a Class A (e.g. every 30 sec. when under 14 knots, as opposed to every 10 sec. for Class A)
  • Does not transmit the vessel's IMO number
  • Does not transmit ETA or destination
  • Does not transmit navigational status
  • Is only required to receive, not transmit, text safety messages
  • Is only required to receive, not transmit, application identifiers (binary messages)
  • Does not transmit rate of turn information
  • Does not transmit maximum present static draught
The AIS function is included as standard in MaxSea Time Zero. Any AIS receiver or transmitter can be connected to MaxSea Time Zero, allowing you to display AIS targets around your boat directly on the charts.
All versions of MaxSea Time Zero come with free, unlimited weather forecasts (Wind, Pressure, Waves, Could Coverage, etc) available worldwide, 24 hours a day.

In addition MaxSea Time Zero Explorer includes unlimited access to oceanic data (Sea Surface Temperature, Altimetry and Chlorophyll).

Weather Forecasts and data are requested directly through MaxSea, allowing you to receive the data via e-mail or to download it directly from the Internet.
When installing the software on your computer, all supported languages are also installed. MaxSea will use the language defined in the « Region & language » settings of your Operating System.

If you want to change the language in MaxSea Time Zero, open the Windows « Control Panel », select « Region and Language » and change the “location” setting.

MM3D Raster Charts
Marine raster charts are produced based on National hydrographic offices’ marine cartograhy. As True digital copies, they allow to get on screen the official marine paper charts that you were accustomed to use.

MM3D Vector Charts
The C- map by Jeppesen vector charts are reproductions of marine cartography where data are processed and digitized in a format allowing additional information: information on buoys, lighthouses and ports, specific instructions on regulations, etc.

Raster or Vector Charts
It's hard to say which chart format is better than the other, the choice is often based ultimately on user habits. The paper marine chart amateurs will prefer electronic raster chart, while those who have always used vector charts will struggle to break away.

Marine navigation software MaxSea Time Zero enables to download and display weather forecast and oceanic data in standard grib format directly from MaxSea Weather Wizard.

This weather tool is completely free and easy to use, giving you unlimited access to weather forecasts worldwide 24hours a day. Select a geographic coverage, data type, period of time and choose how to receive the file. MaxSea Time Zero can provide up to 16 days of weather forecast!

To do this, just send a request and receive weather data either downloading directly from Internet or via Email. The received file weighs only a few kb. The built-in compression algorithm is optimized for binary data (grib format), making downloading over satellite phones and single side band (SSB) possible.

Once you´ve received and opened the grib file, the data will be overlayed onto your charts. Then, you can choose to display all or some of the following weather forecast data: Wind, Waves, atmospheric pressure, clouds and rain.

When selecting digital marine cartography, there are important things to consider. We give you some simple tips on how to choose wisely.

1- First of all, which electronic marine charts formats are compatible with my software?The more versatile your software is, the easier it will be to find the best and most accurate marine charts for your specific area.
MaxSea’s main advantage is its compatibility with a wide range of marine chart formats:

  • Marine Raster charts: MapMedia mm3d Raster
  • Marine Vector charts: Datacore by Navionics, CMAP by Jeppesen & HOs S-57.

2- Where do electronic marine charts originate?Marine Raster Charts are geo-referenced, digital images of Official Hydrographic Office and selected private navigational charts. True colour copies of the official paper marine charts of hydrographic services, raster charts are the most reliable, allowing you to display on screen the official paper marine charts that you were accustomed to use.

Marine Vector Charts utilize a vector database to build the chart display. This data is stored in layers and records every nautical chart feature such as coastlines, buoys, lights, etc. These features and their attributes such as position, colour, size, shape, and others are stored in a database allowing them to be selectively displayed and interrogated. In many areas of the globe where there’s no hydrographic service, vector maps are often the only reference.

3- What is the best navigational chart format: vector or raster?Vector charts or raster marine charts? The choice is complex and raises a real debate between two schools. Hard to say which format is better than the other, and in the end the choice is often lies on user habits or personal preference.  Traditional paper chart users tend to like Raster Charts, since visually these are an exact reproduction of the paper chart. Vector Charts are stored as a database and drawn on the computer or plotter screen by the software, thus the display of a Vector Chart does not resemble a paper chart.

MapMedia offers a wide range of over 6000 marine raster charts restoring the accuracy and reliability of national hydrographic offices paper charts. MapMedia also produces vector charts through collaborations with the best charts editors of the market: Navionics, Jeppesen and some national hydrographic services (databases S57 for USA and Norway). MapMedia is able to provide a complete catalogue of vector charts along with marine raster charts offer.

The basic functionality of taking a screen capture of a window or desktop in Mac OS X takes an image and dumps it to a file on the Mac desktop. Each uses the pressing of Command and Shift keys concurrently as the basis for execution, followed by a number:

  • Command+Shift+3: takes a screenshot of the full screen (or screens if multiple monitors), and save it as a file to the desktop
  • Command+Shift+4: brings up a selection box so you can specify an area to take a screenshot of, then save it as a file to the desktop
  • Command+Shift+4, then spacebar, then click a window: takes a screenshot of a window only and saves it as a file to the desktop
How to Print Screen to the Clipboard on a MacThis functions a lot more like Print Screen in the Windows world. If you want to do the equivalent of Print Screen to the clipboard so that you can paste it into another app, these are the commands you’d want to use:

  • Command+Control+Shift+3: take a screenshot of the entire screen (screens if multiple monitors), and saves it to the clipboard for pasting elsewhere
  • Command+Control+Shift+4, then select an area: takes a screenshot of selection and saves it to the clipboard for pasting elsewhere
  • Command+Control+Shift+4, then space, then click a window: takes a screenshot of a window and saves it to the clipboard for pasting
Remember that the Command key on some older Mac keyboards has an Apple logo on it like this , but newer Mac keyboards will say ‘command’ on them. The command key is located next to the spacebar.

I was inspired to write this post because a colleague just posed this question to me: “Why is there no Print Screen button for Mac?”. I always cringe a little when I hear people talking about printing the screen in Mac OS because it’s a phrase straight from the world of Windows PC’s. With so many people switching to new Mac’s its no wonder the terminology is still prevalent. Once you show someone how to perform the screen capture with a keystroke they understand why there isn’t a need to over complicate the keyboard with unnecessary buttons.

With MaxSea TimeZero Explorer you can directly connect your NavNet 3D network right out of the box! You will have full control of your NavNet 3D Radar/Chart Plotter system directly from your PC. MaxSea TimeZero Explorer integrates seamlessly with NavNet 3D via Ethernet connection. Now you can access and control valuable information from your NavNet 3D network, such as Radar Overlay, Waypoints, Routes and more directly on your PC.