The device is a flux gate compass. I would think that the FAA would want something that does not require power at all. That is kind of the point of having a magnetic compass. Since it is battery powered you might be able to get away with it, but I would think carrying an extra battery and having the means to change it in flight would be required.
As far as a correction card is concerned, yes, you would need one. The fluxgate compass is affected by external magnetic materials in the plane just like a regular magnetic compass is. Flux gate compasses that are made for automotive and marine use have calibration procedures that internally correct the readings, but even very good ones are a few degrees off in some direction. I would suspect that this handheld one would not have compensation built in because it is intended to be hand held and not fixed mounted where the the external magnetic influences are always the same. One other concern I have with it is that the sensor inside it is most likely orientated so that the face of it is parallel to the ground as it would be if you were holding it in your hand. In that orientation you would not be able to see it in the plane unless you put it in your lap. In your phone there are multiple sensors in different orientations so you can hold it vertical or horizontal. My day job is in shipboard electronics. I realize that marine rules and FAA rules are not the same, but for ships the requirement for a compass means a magnetic compass. Even ships with gyrocompasses are required to have magnetic compasses. Some classes of ships are also required to have transmitting magnetic compasses with sensors on them as an alternate method to give heading data to the radar if the gyro fails. -------- Original Message -------- Subject: Re: KR> Possible replacement for a whiskey compass? From: Mike T via KRnet <krnet at list.krnet.org> List-Post: krnet@list.krnet.org Date: Sat, September 19, 2015 2:46 pm To: KRnet <krnet at list.krnet.org> Cc: Mike T <mctaglieri at gmail.com> The device whose ad I originally posted l is battery powered. Am I right to assume that qualifies as "no external power? " I was planning to have no conventional instruments, but to replace the fight instruments wirh a Dynon EFIS, which has a dedicated battery backup. (By the time I'm ready for this, they will be available used or NOS). I also have an old Magellan backpacker's GPS 300 that I was thinking of using as a backup. It's primitive by today's standards as a GPS, but it gives your altitude and shows your compass direction whenever you're moving. Mike Taglieri On Sep 19, 2015 2:36 PM, "gluejam via KRnet" <krnet at list.krnet.org> wrote: > > My understanding is that the intent of a (wet) compass requirement is as a > last resort/emergency/always available navigation tool - with the fluid > serving as a dampening influence compared to a dry compass with no > dampening. In order for any other type to qualify, there must be no > external power needed to make it operational. Therefore, unless one of the > magnetometers you have researched will always operate reliably without > externally supplied power, then no, I can't agree. > > There are probably other views on this topic, though. > > George > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > > _______________________________________________ > Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. > To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org > please see other KRnet info at http://www.krnet.org/info.html > see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change > options > _______________________________________________ Search the KRnet Archives at http://tugantek.com/archmailv2-kr/search. To UNsubscribe from KRnet, send a message to KRnet-leave at list.krnet.org please see other KRnet info at http://www.krnet.org/info.html see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options
