"I am one person who does not like the automatic switching and would
rather have a manual switch for this purpose. "

It is only about three button presses to change it from Day Colors, Night
Colors, or Auto. On page 2 of the Garmin GPSMAP 740 Manual:

*Adjusting the Color Mode*
1. From the Home screen, select Configure > System >Beeper/Display >
Display.
*TIP: Press and release (the power button) from any screen to open the
Display screen.*
2 Select Color Mode.
3. Select Day Colors, Night Colors, or Auto.
The Auto setting automatically changes the color scheme based on sunrise
and sunset times.

http://static.garmin.com/pumac/GPSMAP_700_Series_OM_EN.pdf

On Wed, 24 Oct 2018 at 09:29, Hoyt, Mike via CnC-List <cnc-list@cnc-list.com>
wrote:

> Yes Garmin GPSMAP 740 does the same.  It often does this just as we are
> navigating tricky areas and suddenly the dimness makes it very difficult to
> read.  Switching the light blue to dark blue also causes difficulty.  I am
> one person who does not like the automatic switching and would rather have
> a manual switch for this purpose.
>
>
>
> Mike
>
> Persistence
>
> Halifax
>
>
>
> *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *Ken
> Heaton via CnC-List
> *Sent:* Monday, October 22, 2018 6:54 PM
> *To:* cnc-list@cnc-list.com
> *Cc:* Ken Heaton
> *Subject:* Re: Stus-List inexpensive chartplotter
>
>
>
> My Garmin plotters have two different colour schemes AND two different
> display brightness settings, one colour and brightness for day, and the
> other for night. It switches automatically between these settings at sun
> set / sunrise.
>
> Ken H.
>
> On Monday, 22 October 2018, schiller via CnC-List <cnc-list@cnc-list.com>
> wrote:
> > Fred,
> >
> > I was with Glenn on our first race with the Raymarine Axiom 9.  We were
> fine until full darkness when the screen brightness overwhelmed Glenn to
> the point that he became disoriented.  We literally turned circles in front
> of a freighter until we could get the brightness down and regained our
> night vision.  It seemed like we were doing fine until, suddenly, we were
> unable to compensate for the brightness.  We were used to my Garmin 276C
> (that we had used for the previous couple of years) that automatically goes
> into night mode at sundown.  The GPS knows when local sundown is, it's not
> that difficult to program a night mode.
> >
> > Neil Schiller
> > 1983 C&C 35-3, #028, "Grace"
> > Whitehall, Michigan
> > WLYC
> > Crew member for Wind and Spirits
> >
> > On 10/22/2018 5:25 PM, Frederick G Street via CnC-List wrote:
> >
> > Glenn — you can turn down the brightness using the power button; this
> works well for nighttime use.  But yes, you’re correct, they don’t have a
> specific night color scheme.
> > I don’t think the Lighthouse charts are going to be as good in Canadian
> waters as the Navionics+ North America charts.
> > — Fred
> >
> > Fred Street -- Minneapolis
> > S/V Oceanis (1979 C&C Landfall 38) -- on the hard in Bayfield, WI   :^(
> >
> > On Oct 22, 2018, at 4:19 PM, Glenn Gambel via CnC-List <
> cnc-list@cnc-list.com> wrote:
> > Fred,
> > Just wondered if I am correct that Raymarine Axiom 9, which I have with
> Navionics+, still does not have a night mode similar to Garmin?  When I
> discovered that, I contacted their support guy (Charles, Chuck) and he
> indicated they did not have a night mode.  He started a ticket on that
> request to determine if one could be added.  What in the world were they
> thinking.
> > Secondly, I could swap out Navionics+ for the Raymarine charts, but
> wonder what you think of both?  I will be traveling up into Canadian waters
> (Lake Huron, Georgian Bay) this summer and wonder if there is a difference
> in what one sees on the charts?
> > Thank you,
> > Glenn Gambel, 1981 C&C 36
> > Wind N Spirits
> >
> >
> > _______________________________________________
> >
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> >
> >
> _______________________________________________
>
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