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24 MARINE REVIEW COURSE FINDER. A VOLUME THAT IS NEW AND. ORIGINAL. NOT TO BE COMPARED WITH ANYTHING NOW ON THE MARKET, A BOOK THAT IS OF PRACTICAL NEED, CAN BE USED ON EVERY BOAT AND AT EVERY HOUR OF THE DAY. CONTAINS NO DRY" NURSING 'LIKE OTHER PUBLICATIONS WITH SIMILAR TITLES. NO OTHER WORK CAN TAKE ITS PLACE, IT IS THE ONLY WORK OF ITS KIND. NO MASTER, MATE OR SAILOR SHOULD BE 'WITHOUT IT. ANXIETY AND RELIEVE YOU. OF MUCH RE- SPONSIBILITY. IT MIGHT BE THE MEANS OF KEEPING YOUR BOAT OFF THE ROCKS AND 'THE SAVING OF DRY DOCK BILLS.~ IT Is EASILY UNDERSTOOD AND THOROUGHLY PRACTICAL, IS CORRECT BOTH THEORETICAL- LY AND PRACTICALLY, BY CLARENCE E. LONG; PRICE, $2.50. The Marine Review COURSE FINDER is a book that should interest every master, mate and sailor on the Great. Lakes. It should be particularly interesting on account of its great prac- tical utility and the simple manner in which it can be used. It will be found to be the greatest help and aid to any man who is in command, or on whom the shaping and setting of courses de- volves. _It answers the same purpose on the small boat as on the large boat. In fact,-it applies wherever lake navigation is applicable. : The book contains all the Correct Magnetic Bearings of the lighted and unlighted river and harbor ranges and all the Mean Correct Magnetic Courses on the chain of lakes, with an explana- tion of a simple method of making or finding the course to ke steered between any two points on the lakes, no matter _where they are. No matter what the course to any certain place may be by your compass the course finder will tell you what it is. 'No figures are required in the method, not even so much as a mental calcula- tion being necessary. The course finder allows the. variation and deviation for you so that it is not even necessary to know the first thing about the laws of variation. and deviation. It will be found just as necessary and convenient for the man who does understand all about compass corrections. It is a meth- od that should be employed as a check -in all azimuth work. It was designed as a makeshift for azimuths for when it is cloudy azimuths of heavenly bodies _ are not available. So long as the sky is not overcast azimuths supply one of the most. important needs of lake naviga- tion; but when it is cloudy and for sev- eral days at a time, as it often is, the navigator is up against a stiff proposi- _ tion for making his courses. This is especially so when the deviations change with different trims of the boat. In IT WILL, SAVE YOU MUCH | THE MARINE REVIEW cases of this kind the course finder will be' found of the greatest assistance, The course finder will be found usefui at all. times, no matter what the conditions of the weather may' be. It has often been said by lake navi- gators that if the correct magnetic bear- ings of all the lighted ranges on the lakes were given it would be of the greatest assistance to the lake master for finding his compass deviations. The course finder has done this and a great. deal more. No other work on the mar- ket will be found more useful to the lake master. than the work to be per- formed by the course finder. One of the greatest difficulties the 'lake | navigator has in the use of -his com-'! pass is the change in the déviation® dite' to a change in the trim of his'!boat)°such as being light, loaded, half' loaded, etc. When azimuths are available the naviga- tor can make them answer his purpose, . but when they are not he must employ other means. It is the purpose of this work to take the place of azimuths when the sky is overcast. A few 'practical examples will , better -- illustrate the system: To make good or find the compass course to be steered "between Eagle Harbor and Ashland, having previously noted course by the same compass when heading on Pt. aux Pins range, merely port %-pt. from the course shown when on this range. Supposing that your compass read SW 1% W when heading on Pt. aux Pins; SW x W &% W then would be the course to steer by this compass from Eagle Harbor to Ashland, because porting 54-pt. from SW % W makes SW x W % W. Devils. Island to Superior, port 1%4-pt. from the compass course shown when heading on Pt. aux Pins range. Nine Mile Pt. to Presque Isle, star- board: %-pt. from the course shown when in range with Chicago pierhead and Four Mile Waterworks Crib. Chicago to Pt. Betsey, port 34-pt. from the course shown when in range with Chicago pierhead and Chicago Water- works Crib, - Niagara Bar to. South Bay Pt. (Lake Ontario), port %4-pt. from the course shown when heading on St. Mary's River Lower range, or steer same course as shown when heading on Vidal Shoal range, : SE. Shoal lightship to Cleveland, star- board %-pt. from the course. shown when heading on: St. Mary's River up- per range. Another feature of the work. is the blank forms for tabulating the deviation of the compass on all the river ranges. This form indicates just how a com- pass should read when weading on that particular range, so that the difference between what the compass says and the ' 'in a moment's noticé. 'came' very enthusiastic and correct magnetic bearing of the range is the deviation. In this method there is no chance of confusing the variation | with the deviation. In conjunction with this there is a deviation curve card for obtaining the deviation on those points of the compass for which there are no ranges. The practical utility of this card is that the greatest amotint of the work has been done so that the navigator can obtain the deviation for ahy' point or quarter point of the '€ompass:so desired, The' entire meth- od is so simple that any one must be able -- to understand it. The tabular forms and deviation curve blank are not essen- tials to the system, but they have been supplied, so that in the event of a mas- ter wishing to determire his own de- viation and allowing it to his corrected course he has a ready means of doing so. The system recommends itself to favor more on 'account of' its practical utility and simplicity than anything else. No great claim is made for the orig- inality of the system, for it has and is being practiced every day, but it is the ease afid convenience that the naviga- tor can handle this part of his work that merits consideration if not com- mendation. Practical men to whom the- nature of the work has been explained and to those who had an opportunity of looking over the typewritten copy for the book, be urged its printing at the earliest possible moment. Several ship masters were so eager for a copy of the work that they offered the publishers $25 for the privilege of hav- ing a copy typewritten from the original copy. : The book also contains a number of chartlets showing .the correct magnetic bearings of all the ranges of the princi- pal lake ports. Their positions are ac- curately drawn ard each range marked © and at the same time showing just how your compass should read with your boat's head on that particular range. These harbor charts were added to the work so that there would be no possible confusion in getting the range desired. This work will also be found useful in compass adjustment, since it shows at a glance just what ranges at the different places are most available for the pur- pose. There are many other things for which the work will be found useful. -QUESTIONS FOR WHEELSMEN AND WATCHMEN. NINTH INSTALLMENT, 97. What does three short blasts of the steam whistle indicate ? 98. What does three blasts of a fog horn on a sailing vessel indicate? 99. What signal should-a vessel blow when making a bend where she cannot see Over it?