Guest Mr_Macaw Posted July 15, 2001 Share Posted July 15, 2001 My 315 has two settings for 'elevation': 2D and 3D. It says in the manual that in 3D mode it calculates elevation itself, whereas in 2D mode you simply enter an elevation to use for everything. It also states that it requires fewer satellites to get a lock in 2D mode than in 3D mode. Now, I'm not worried about getting an elevation from the GPS, so I thought that I should set it to 2D mode so I could more easily get a lock. However, I am concerned that in 2D mode the unit might use the elevation I enter as part of its position calculation, and therefore give me less accurate reading. Is this the case, and are there any other factors I should consider? Thanks. Quote Link to comment
Guest Rubberhead Posted July 15, 2001 Share Posted July 15, 2001 Garmin has a great guide called GPS for beginners located on their website. It's in Adobe format. Here's the address: http://www.garmin.com/aboutGPS/manual.html This guide explains 2D vs. 3D navigation. However, it usually only takes 4 satelites to get a 3D lock. Any less than that, the accuracy will suffer anyway. To be most accurate, try to get as many satelites as possible. All GPS satelites are continually moving (except for the new WAAS satelites) so, four satelites that are close together in the sky won't give you as accurate a position as four satelites that are spread out. Good luck. Quote Link to comment
Guest c_oflynn Posted July 15, 2001 Share Posted July 15, 2001 Hi, 2D mode only needs 3 satillites, 3D needs 4 or more. I would just go with 3D mode, the mag315 will easily pick up the 4 satillites needed. Also, the more satillites you get the better. Colin Quote Link to comment
Guest c_oflynn Posted July 15, 2001 Share Posted July 15, 2001 looks like rubberhead got in a reply while I was still typing Quote Link to comment
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