3 ms·
"A single 1-kW jammer can take down GPS for a 300-nm radius.[...] A CRPA can shrink the effective radius of the 1-kW jammer to 3 nm. The jammer’s area of effect
by gibibit 1y ago
"A single 1-kW jammer can take down GPS for a 300-nm radius.[...] A CRPA can shrink the effective radius of the 1-kW jammer to 3 nm. The jammer’s area of effectiveness is slashed from 280,000 m² to 28 m²."
An example of the kind of unit confusion that could crash a Mars orbiter?
I thought we were talking about nanometers and square meters here for a second. But this only makes sense if "m²" means square miles and "nm" means nautical miles. How about at least using "mi" for miles to reduce confusion?
- SAI_Peregrinus 1y agoAgreed, though there's a space between the number & the unit which generally indicates non-SI units (SI should never have a space). The switch from nautical to statute miles is still really weird though.
- fenced_load 1y agoAre you sure? NIST says there should be a space: > There is a space between the numerical value and unit symbol, even when the value is used in an adjectival sense, except in the case of superscript units for plane angle. https://physics.nist.gov/cuu/Units/checklist.html https://physics.nist.gov/cuu/Units/checklist.html
- Propelloni 1y ago> SI should never have a space You are mistaken. SI units and their numbers always have a space. For reference [1], [2]. [1] https://www.npl.co.uk/si-units https://www.npl.co.uk/si-units cf. Numerical Notation [2] https://physics.nist.gov/cuu/Units/checklist.html https://physics.nist.gov/cuu/Units/checklist.html cf. #15 EDIT: Scooped ;)
- ak1ng 1y agoThat's nonsense. There is a space between the number and the unit in SI.
- deleted 1y ago[deleted]
- lbourdages 1y agoWell, nautical miles are the standard unit in the context of aviation, so I don't think it's all that bad. "mi" refers to a different unit.
- gibibit 1y agoTrue, "nm" initially seemed to be nautical miles, but then this square meters thing appeared. The point is that "m" should be meters, but "mi" would be a more customary abbreviation for miles in the U.S.
- lupusreal 1y agoThey shouldn't have switched from nautical miles to miles. The area should have been expressed in square nautical miles.
- out_of_protocol 1y agomile and nautical mile are not the same so it still doesn't make any sense
- dpifke 1y agoFrom https://news.ycombinator.com/newsguidelines.html https://news.ycombinator.com/newsguidelines.html: Please don't complain about tangential annoyances—e.g. article or website formats, name collisions, or back-button breakage. They're too common to be interesting.