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GPS City Q&A » Outdoor GPS » What is Dead reckoning?

Outdoor GPS (2 replies)

Item

Original Question

What is Dead reckoning?

› Garmin GPSMAP 60CSx

Author

Reply

Rick
Tuscaloosa, AL

Original question asked on Nov 27, 2009, 8:44am

I notice the 60CSx does not include a dead reckoning feature. What exactly does Garmin mean when it uses the term?

Next, will the 60CSx allow me to navigate directly to a waypoint, i.e., across country with a directional line on the screen (similar to my old SPIII)?

Thanks in advance.

GPS City
Las Vegas, NV

Reply #1 on Nov 27, 2009, 8:59am

Hello
Dead reckoning is a Marine term. In Short it is used to guesstimate your Speed. You drop a item in the water at the Bow (Front) of the boat and measure the time it takes to get to the AFT (Back) of the boat. Velocity = Distance/Time .
After doing the calculation you can get a rough speed. Some GPS units will use an inertial sensor to do the same. It is for when you drive into a tunnel (or similar) and lose satellite reception. You will still know the speed until you get satellite reception again. I hope this helps.

All Garmin GPS units can do point to point routing.

Cheers

crocodile_dondii
Yellowknife

Reply #2 on Mar 17, 2011, 8:04am

"Dead" reckoning is actually misspelled. It should be "Ded" which is an abbreviation for "deduced" reckoning, or simply DR.

This occurs when you don't have external data input for a device to navigate for you, so the device proceeds using the last known data (speed & direction vectors). It then computes your progress & position by deduced reckoning.

The deduced position is updated later when the satellite data becomes available again. The longer the outage, the less reliable your DR position is, so beware of it if you have to depend on it.

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