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GPS City Q&A » Marine GPS » Is there speed info and which is best dual beam or dual frequency?

Marine GPS (3 replies)

Item

Original Question

Is there speed info and which is best dual beam or dual frequency?

› Garmin GPSMAP 431s Sounder with Dual Beam Transducer

Author

Reply

Alain
Cantley

Original question asked on Sep 11, 2010, 5:44pm

Hi,

1. Out of the box, does this model provides GPS Speed info?
2. Which is best dual beam or dual frequency?

Tks,

GPS City
Calgary, AB

Reply #1 on Sep 13, 2010, 10:16am

Hello Alain,

1. All GPS Chartplotters give you speed over ground. If you have a speed wheel on the transducer you can do speed through the water also taking into account currents.
2. The best is to get a dual freq/dual beam transducer so you can switch frequencies and beam widths using the unit. Here is one suggestion.
http://www.gpscity.com/garmin-dual-freq-transducer-depth-temp-speed-plastic.html

Cheers

fernando
miami

Reply #2 on Aug 5, 2011, 7:46pm

Hi there my name is fenando, can i use my garmin 431s with dual transducer on open water i just move to miami and i dont want to buy a diferent unit for sea?

GPS City
Calgary, AB

Reply #3 on Aug 8, 2011, 7:31am

You can use the 431S with a Dual freq or Dual beam Transducer.

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