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"TAE MARINE REVIEW 45 Marine Review Course Finder By CLARENCE E. LONG Contains All the True and Mean Correct Magnetic Courses; True and Correct Magnetic Bearings of the River and Harbor Lighted and Unlighted Ranges for All the Lakes; also a Simple Method for Shaping'and Making These Courses by any Compass and for any Boat A volume that is new and original. Not to be compared with any- thing now on the mar- ket. 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 sim- ilar 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. It will save you much anxiety and relieve you © of much _ responsibility. It might be the means of keeping your boat off the rocks and the saving of dry dock bills. It is easily un- derstood 'and _ thor- oughly practical. Is correct both theoret- ically and practically. The Narine Review Course Finder is a book that should in- terest every master, mate and sailor on the Great Lakes. It should be particularly inter- esting on account of its great practical util- ity 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' devolves. It answers the same purpose on the small boat as on the large boat. In fact, it applies wherever lake navigation is ap- plicable. We send this book on approval to respon- sible parties. '\ PRICE $2.50 A FEW THINGS THE COURSE FINDER WILL DO The mean correct magnetic course from Chicago to Pt. Betsey isNx EE. The correct magnetic bearing of the light on the SE end of Chicago break-water in range with the light on the Chicago Waterworks crib is N % E. To make good this course place your boat on this range and when Steady note the course by compass, and then port %-point from whatever the course shown when on with this range will take you to Pt. Betsey. ' Buffalo to Long Pt. same course as shown when in range with Buffalo Lighthouse and Waverly Shoal Gas © Buoy. No matter what the course may be by com- pass when your boat is steady on the above range the course then shown by compass is the one you will have to Steer in order to fetch Long Point correctly. SE Shoal lightship to Cleveland, starboard %-point from the course shown when inrange with Chicago SE breakwater light and Four- Mile crib; or starboard %-point from the course shown with Poverty Island Gas Buoy in range with Poverty Island lighthouse., or starboard} -point from the course that takes you from Old Mackinaw to Cheboygan light- house; or starboard \%-point from the course shown when head- ing on St. Mary's River Up- per Range, \ \ \ BOOK DEPARTMENT In conjunction with - the Course' Finder there is a Deviation Log Book, which , gives all the: river ranges just as your compass should read if 10 = were. correct. There are blank spaces after each range for recording the compass reading when on the range. This is all the data required for using the Course Finder. An auxiliary to this is a Deviation Diagram,the compass straightened _ out instead of circular. Every river range that conforms to a certain bearing by compass is printed over its equiv- alent line on the dia- gram, so that all that is necessary for getting a full deviation curve _ is to put lay off on the proper line how much your compass is "off" and draw a. curve through them. There is a book of explana- tions with practical ex- amples for illustrating the diagram. Follow- ing isalist of the works together with the price of each: Course Finder $2.50 Dev. Log Book, {2setsof4re- cording sheets .75 Dev. Diagram, {2 of them.... 1.50 Book explain- ing Dev.Curve .75 3 Magnetic Charts, Chicago, Cleveland, Buffalo #00 $6.50 Complete set $6 car- riage prepaid. Course Finder and Dev. Log together $3. Dev. Dia- gram and book show- ing how to draw curve. $2. Single magnetic chart 50c. Penton Publishing Company, Cleveland, Ohio | lc RA NS A OBIE PEN RPA PIES EL SORE IS BOSE A AEE SE TOLL