Question about GPS

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Hi all im using Canon SX260 HS which have gps and altitude feature. Im having problem where the altitude reading is not accurate. Any idea why is this happening or anything i can do to make it right. Using it for aerial photography task so the data's altitude is important. Thank you.

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I think this has to do with the limitations of the GPS device build in your Canon. The device is not build to fly in a plane. You are moving to fast. I'm convinced if you are on a mountain the device will have no problem displaying the correct altitude. And when in a plane, the small antenna inside will have trouble finding good signals. Look what the Canon does, while you are still on the ground. See if it finds enough satellites in a short time. Check if the airplanes body works as a shield.

Posted on May 13, 2014

  • Mohd Mirza May 14, 2014

    Thanks Harrie. But I noticed it is not the problem of the airplane. I've tried the camera at a 4-storey building which has a hallway for me to get a perfect signal of gps. The result is still the same.Sometimes the altitude reading can get up to "-" value. I even let it on a tripod on a football field, but still the altitude reading showed 40m.

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SOURCE: Garmin Hand held GPS Operation

v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} It’s hard to cover all the details in a forum like this but I’ll give you a quick primer. I can send you a powerpoint presentation that explains it in a little more detail. To really learn how to read latitude and longitude you should pick up a copy of “Chapman’s Piloting and Seamanship.”

The earth is divided into parallels of latitude and meridians of longitude, also known as lines of position.

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Latitude is measured north and south of the equator, with the equator represented as 0 degrees, and the poles being represented as 90 degrees North or South. Latitude lines are paralel to the equator. For example, if I was at the equator I would be at 0 degrees. If I traveled exactly 60 nautical miles to the north, I would be at 1 degree North, and if I traveled another 60 miles I would be at 2 degrees north. Your GPS display will preface the Latitude measurement with an “N” for positions North of the equator and an “S” for positions south of the equator.

Longitude measures your position east or west from the Prime Meridian, which is a line represented as 0 degrees that bisects the earth from north to south and passes through Greenwich England. Halfway around the earth at the International Dateline Longitude is 180 degrees. Measuring Longitude is a little more complicated because the lines are not parallel and requires an accurate clock (your GPS) to compare time at your location relative to the time in Greenwich England. Your GPS display will preface the Longitude measurement with a “W” for positions west of Greenwich and an “E” for positions east of Greenwich.

To make more accurate measurements each degree is divided into 60 minutes. Because the lines are parallel, 1 minute of latitude is equal to 1 nautical mile. Each minute can be further divided into 60 seconds. Each second is roughly equivalent to a distance of 100’ Instead of seconds, the default setting on your Garmin breaks the minute down into tenths, hundredths, and thousandths for meven more precise measurements. Because they are not parallel, lines of Longitude are measured the same way, but the distances vary depending on how far north or south of the equator.

To find out where you are with a GPS, you need a map that shows lines of latitude and longitude on it. The lines will be labeled on the map or along the borders of the map. Most nautical charts show the latitude measurements along the right the left border of the map. Longitude measuremnts will be shown along the top and bottom edges.

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SOURCE: gps will not announce street names, highway's, etc. Important note: it had been announcing this data since I bought the GPS in December but just recently stopped doing so.

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