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02-01-2019, 08:28 PM
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#1
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Senior Member
Tiffin Owners Club
Join Date: Mar 2018
Location: Hot Springs, VA
Posts: 1,997
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Garmin RV 770 LMT-S Routing?
I'm planning a trip across the Chesapeake Bay Tunnel Bridge (southbound) this May with my Beacon which is suppose to be 12' 11" in height. I pick it up in March, so I haven't been able to get a confirmed height. But let's assume for now that the height is 12'11" as stated. The tunnel's max stated ht. is 13'6".
I'm programming my trip in my Garmin RV 770 LMT-S GPS system, and it will not route me through the tunnel. Even when I drop the height to 12' and remove the propane bottles from my configuration. I know tractor trailers go through. I hate to ignore the gps because perhaps there is some other impassible obstacle on the southside...but I guess the GPS is just wrong, but why? Is there possibly another parameter that is causing the problem?
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RoadEyePie - 2019 VLRV Beacon 39 GBB
2018 GMC 3500 HD Sierra Denali Durmax Diesel DRW CC LB 4x4
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02-02-2019, 04:19 AM
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#2
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Senior Member
Join Date: Jul 2013
Location: North Ridgeville, OH
Posts: 2,455
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posted response in duplicate post
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Retired but busier than ever! 
2012 Newmar Bay Star 3302
5 Star Tune, SumoSprings, Roadmaster Steering Stabilizer, Blue Ox Avail
Brake Buddy, 2015 Chevy Malibu
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02-02-2019, 06:03 AM
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#3
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Senior Member
Tiffin Owners Club
Join Date: Mar 2018
Location: Hot Springs, VA
Posts: 1,997
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Yep, wasn't sure which forum was the best fit. At any rate, I've played with navigation preferences and determined that the Garmin is buggy. Have changed a parameter, got it to work. Turned it off, broke it again. Turned it back on, and it doesn't work. Inconsistent.
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RoadEyePie - 2019 VLRV Beacon 39 GBB
2018 GMC 3500 HD Sierra Denali Durmax Diesel DRW CC LB 4x4
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02-02-2019, 07:59 AM
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#4
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Senior Member
Join Date: Nov 2012
Posts: 1,293
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Always try and use the Garmin and Mapquest/Goggle for a second opinion. Also, there is a program called low clearance. Do not want a convertible Motor Home.
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Wally & Elta Mae
2007 Allure 470 Sunset Bay #31535
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02-02-2019, 09:54 AM
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#5
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Senior Member
Tiffin Owners Club
Join Date: Mar 2018
Location: Hot Springs, VA
Posts: 1,997
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Quote:
Originally Posted by wfalch
Always try and use the Garmin and Mapquest/Goggle for a second opinion. Also, there is a program called low clearance. Do not want a convertible Motor Home.
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Yes, I've watched 11foot8.com.
For the record, I reset the Garmin to factory defaults, reloaded everything and it's allowing me to go through the tunnel now. I've been through the tunnel a few times in my car and even though it says that it's 13'6" and I'm 12'11" now, it's not going to be easy to pull a new Beacon through there.
__________________
RoadEyePie - 2019 VLRV Beacon 39 GBB
2018 GMC 3500 HD Sierra Denali Durmax Diesel DRW CC LB 4x4
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02-02-2019, 08:45 PM
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#6
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Senior Member
Join Date: Jun 2016
Location: SW Louisiana
Posts: 8,954
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Quote:
Originally Posted by RoadEyePie
Yes, I've watched 11foot8.com.
For the record, I reset the Garmin to factory defaults, reloaded everything and it's allowing me to go through the tunnel now. I've been through the tunnel a few times in my car and even though it says that it's 13'6" and I'm 12'11" now, it's not going to be easy to pull a new Beacon through there.
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Yeah that site makes me glad my coach is 11'5" to the top of the air conditioner.
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2002 Safari Trek 2830 on P32 Chassis with 8.1L w/ 400 watts solar 420Ah LiFePo4
2017 Jeep Cherokee Overland & 2007 Toyota Yaris TOADs with Even Brake,
Demco Commander tow bar and Blue Ox / Roadmaster base plates
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02-17-2019, 06:47 AM
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#7
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Member
Join Date: Aug 2017
Posts: 41
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I found that the Garmin uses the height of the lowest point which if the roof of the tunnel or bridge is curved, is on the sides.
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Regards, Glenn
2018 Holiday Rambler Vacationer 35K, named HaRVey the RV.
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