Who wants to be a navigator?

[datto510]

At 1210 zone time, on 1 December 1981, you depart Seattle, LAT 47° 36.0' N, LONG

122° 22.0' W (ZD +8). You are bound for Guam, LAT 13° 27.0' N, LONG 144° 37.0' E,

and you estimate your speed of advance at 20 knots. The distance is 4,948 miles. What

is your estimated zone time of arrival at Guam?

 

Well? What is the date and time of arrival? Hmmmmm?

[izzo]

Not doing your homework for you dood, sorry! :rofl:

[ariascarlos1990]

Or is this a Job offering? Hmmm?

[datto510]

Not doing your homework for you dood, sorry! :rofl:

 

Awww came on!

 

 

Or is this a Job offering? Hmmm?

 

Maybe... ;)

[INDY510]

.

206.16666 hours

[datto510]

.

206.16666 hours

 

Negatory. But you are on the right track.

[bananahamuck]

Would help but i have to look at my hands to remember how many fingers i have.

[wayno]

Would help but i have to look at my hands to remember how many fingers i have.

You don't have enough fingers, but if you count the thumbs I think it can be done.

[Denken]

Assuming its 12:10 pm in location of departure you would arrive in guam

December: 11th at 5:07:48

 

Travel time 215.130 = almost 8.9 days and 7.8min + the 18hr time difference.

 

-DENK

[HRH]

Actually, you forgot to consider factor D. As in, 20 knots is hella slow, and I'm going to go get in my Datsun factor and drive to Guam. Then there's factor FD, which would be Flying Datsun because your Datsun is that damn fast. So considered, you would arrive in Guam on December 1st, 1980, just in time to achieve this feat before Michael J Fox did it in a Delorean. :D

[Shonuff]

tuesday

[RAlly_DatoB210]

Actually, you forgot to consider factor D. As in, 20 knots is hella slow, and I'm going to go get in my Datsun factor and drive to Guam. Then there's factor FD, which would be Flying Datsun because your Datsun is that damn fast. So considered, you would arrive in Guam on December 1st, 1980, just in time to achieve this feat before Michael J Fox did it in a Delorean. :D

 

so November 12 1955? Eh eh? Might appear that way in Guam anyways.

[datto510]

Assuming its 12:10 pm in location of departure you would arrive in guam

December: 11th at 5:07:48

 

Travel time 215.130 = almost 8.9 days and 7.8min + the 18hr time difference.

 

-DENK

 

It will take 247.4 hrs to travel 4948nm at 20kts. That is equal to 10.31 days =(10 days 7hrs and 24mins).

 

The original time of 1210 must be converted to GMT, (ZD+8) in the West longitudes. This makes our time of departure GMT 2010. Add the travel time of 10.31 days and you get 0334 Dec 12. The ZD of Guam is -10E so we add that to our GMT time to come up with 1334 12 Dec, 1981.

 

 

I have been studying stuff like this constantly for the last three weeks. I will be sitting next week at the Coast Guard Regional Exam Center to take a 3 day test in order to upgrade my Merchant Mariner License. It sucks. Haven't these guys ever heard of GPS?

 

 

 

Actually, you forgot to consider factor D. As in, 20 knots is hella slow, and I'm going to go get in my Datsun factor and drive to Guam. Then there's factor FD, which would be Flying Datsun because your Datsun is that damn fast. So considered, you would arrive in Guam on December 1st, 1980, just in time to achieve this feat before Michael J Fox did it in a Delorean. :D

 

:D

[flyerdan]

GPS is fine, but when some crackpot North Korean despot fires off an EMP strike, all that will go away. Dead reckoning and celestial navigation have been around for ages, and will continue to be relevant.

[datto510]

GPS is fine, but when some crackpot North Korean despot fires off an EMP strike, all that will go away. Dead reckoning and celestial navigation have been around for ages, and will continue to be relevant.

 

I'm all for celestial and dead reckoning, in fact I use it every day. I don't know how relevant they will be in the near future when ships no longer carry paper chart.

[datsunaholic]

You didn't say in your question if it was nautical miles or statute miles.

 

I used to do navigating in the Navy, but only on small (33ft or less) boats in inland waters, where we could see land (if it wasn't too foggy or rainy). It was the engineer's job to be navigator/radioman on our boats, though sometimes the engineer was a gunner and they had someone else do the nav/radio.

 

One of our drills was to navigate blind. They threw a blanket over the windows and had us go from the Hylebos Waterway in Tacoma to Quartermaster Harbor in Vashon, by dead reckoning. With the GPS off. The radar was on, but it was a little recreational Furuno that hardly worked worth a rat. We did have an Observer stand as lookout to make sure we didn't get in trouble, but they were there solely for safety. Those drills were done via dead reckoning, which isn't easy in a confined harbor when you can't see, with running variable currents. Since we had no speedometer and the GPS was off it was impossible to know the actual speed over ground. We had taken "estimated" speeds by running the engines at various RPMs, then using the GPS to figure out the speed, making a conversion table, but it was quite inexact.

 

Generally though we didn't do official navigation, because we were patrolling small, usually less than 1/4 mile wide, boxes near bases or ships. We would do navigation plots for our familiarization runs, to ID shoal water and hazards, but after that it was required that we be unpredictable when doing patrols.

 

 

As for ships, it's not uncommon for US Navy ships doing a solo run across the Atlantic to shut off their GPS and have the Qurtermaster navigate the ocean via celestial navigation. The idea is to make sure that it still can be done.

[INDY510]

your speed of advance at 20 knots. The distance is 4,948 miles.

It will take 247.4 hrs to travel 4948nm at 20kts. That is equal to 10.31 days =(10 days 7hrs and 24mins).

 

Hey man!!!! ....... WTF!!!!! ........ the original question was how long does it take to travel 4,948 Miles ...... while going 20 Nautical Miles an hour

 

So I had to find the conversion to 1.15077 Knots = 1 mile ........ .. which means your'e traveling at 23.01 MPH

 

 

Which would be a little over 215 hours .......... .. .. Datto510: YOU FAIL........... :fu:

[datto510]

You didn't say in your question if it was nautical miles or statute miles.

 

I used to do navigating in the Navy, but only on small (33ft or less) boats in inland waters, where we could see land (if it wasn't too foggy or rainy). It was the engineer's job to be navigator/radioman on our boats, though sometimes the engineer was a gunner and they had someone else do the nav/radio.

 

One of our drills was to navigate blind. They threw a blanket over the windows and had us go from the Hylebos Waterway in Tacoma to Quartermaster Harbor in Vashon, by dead reckoning. With the GPS off. The radar was on, but it was a little recreational Furuno that hardly worked worth a rat. We did have an Observer stand as lookout to make sure we didn't get in trouble, but they were there solely for safety. Those drills were done via dead reckoning, which isn't easy in a confined harbor when you can't see, with running variable currents. Since we had no speedometer and the GPS was off it was impossible to know the actual speed over ground. We had taken "estimated" speeds by running the engines at various RPMs, then using the GPS to figure out the speed, making a conversion table, but it was quite inexact.

 

Generally though we didn't do official navigation, because we were patrolling small, usually less than 1/4 mile wide, boxes near bases or ships. We would do navigation plots for our familiarization runs, to ID shoal water and hazards, but after that it was required that we be unpredictable when doing patrols.

 

 

As for ships, it's not uncommon for US Navy ships doing a solo run across the Atlantic to shut off their GPS and have the Qurtermaster navigate the ocean via celestial navigation. The idea is to make sure that it still can be done.

 

Engineers navigating?! Blasphemy! :rofl:

 

 

Hey man!!!! ....... WTF!!!!! ........ the original question was how long does it take to travel 4,948 Miles ...... while going 20 Nautical Miles an hour

 

So I had to find the conversion to 1.15077 Knots = 1 mile ........ .. which means your'e traveling at 23.01 MPH

 

 

Which would be a little over 215 hours .......... .. .. Datto510: YOU FAIL........... :fu:

 

1knot = 1 nautical mile per hour. The problem gives distance and speed. Distance divided by speed equal time. :fu:

 

It is implied that the question is in nautical miles.

[datsunaholic]

Engineers navigating?! Blasphemy! :rofl:

 

 

 

 

It's one of those oddities of the Naval Reserves. I was an engineer, but did the navigating and radio, and even learned how to properly land the boat. We were Navy, but wore green camo, lived in Tents, drove Hummvees, Deuce-and-a Halfs, 5-tons, and other Army trucks, ate MREs, carried M16s, M60s, and M2 .50 cals. You had to know everybody else's jobs. The Boatswain's mates had to know how to repair the engines, or at least know casualty responses. We had Supply clerks driving boats, engineers doing nav plots, and corpsmen manning guns. This was in stark contrast to the Surface Navy where there was very little true cross training. Just enough cross training to get your quals signed.

[HRH]

As my uncle always jokes: "You know what engineers use for birth control right? Their personalities!!" :D I still like engineers, especially the ones with senses of humor.