We used to plot manually in order to check we were where we were supposed to be. What is the difference between the cross-checking versus plotting?Īcceptable procedures are outlined in section 6.4.8 of AC 91-70B. It isn’t about drawing it on a map so much as checking and cross-checking your position.Ĭlick to download the official FAA chart. Well, the simple answer is yes, and the more complicated answer is that “plotting” means something a little different now.
Turbojet aircraft: If you are operating along a route segment where the distance between standards ground based navaids exceeds 725nmīut – this was removed in the new AC. The earlier FAA AC 91-70A had a whole section (3.6) on when plotting is required: (Position Plotting 8.2.10) When do we need to plot? The FAA say “ you should use a chart, of appropriate scale, to provide yourself with a visual presentation of your intended route, regardless of your type(s) of LRNS.” (6.3.1.11)Īnd ICAO say… actually they pretty much say the same. So plotting can help catch those navigation errors before they become really ‘gross’. The second problem is we make mistakes – sometimes we put the wrong things in the box (see the section on half degree waypoints below). The North Atlantic is big and remote and unlike land, there aren’t many places to put Navaids, which means you are relying entirely on your Long Range Navigation Systems (usually something to do with satellites) to ensure you are in the correct place. We plot so that we can check that the airplane is actually going where it should be going, and that we are where we are supposed to be. Click for info on how to download a copy! Why do we need to plot? Here is the Opsgroup North Atlantic 2021 chart. So, this post is just looking at plotting. We actually started writing this post in 2019 when the current AC came out… Sounds good until you actually open and discover it is 114 pages long and the first chunk is a very long list of links to other documents which you also need to refer to for information and guidance. It is an advisory circular providing ‘ general information and guidance for commercial and General Aviation operators (“you”) planning flights in oceanic and remote continental airspace’. The place to find the info is this – AC 91-70B So here is a brief summary of the FAA Plotting requirements. For most though it is an irritating thing not made an easier by the somewhat confusing requirements as to how, when and why you need to do it. If the other pilot has added some tiny krakens or miniature pirate ships to find on the chart, it can be a fun way to pass the time on a dark and endless North Atlantic crossing.
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