Re: [Amel] Re: Mounting of AIS GPS ANTENNA
We too use an antenna on top of the mast using a spliter VHF/GPS and get very good contacts with major ships with our receive only unit. AIS is a very good safety device. We prefer using a stand alone display unit as there can be to much clutter on the Furuno radar/plotter in T-stroms.toggle quoted messageShow quoted text
Sent via BlackBerry by AT&T
From: "Judy and Bill aboard SV BeBe" <yahoogroups@...>
Date: Mon, 28 Jun 2010 03:06:23
Subject: [Amel] Re: Mounting of AIS GPS ANTENNA
Eric & Richard,
VHF is line of sight and rarely bounces. Mounting at the top of the main mast gives you around 10 miles further reach than mounting on a rail. The "range gained" formula is: 1.17 times the square root of the additional height in feet = additional range in nautical miles. The horizon while standing on the deck is 3.5 miles...from the top of the mast it is 10 miles.
If you want to maximize being seen and seeing others, go up.
GPS does not need height and will work OK under a dodger.
s/v BeBe, SM2k, #387
--- In amelyachtowners@..., kimberlite <kimberlite@...> wrote: