Topo maps for a Garmin
~ Captain Paul's response to: ~ Fish Flies ~
Keep your old copy of MapSource in your computer, and if possible download the new Garmin BaseCamp and their HomePort. Both are free from their website. Both of these programs allow you to load maps, waypoints, routes and tracks from your computer to a SPARE memory card this used to transfer the data. Garmin now requires that the memory card used to make the transfer, be first placed in your GPS unit. You have to then turn the unit on and complete any function. Changing viewing screens is sufficient. This action writes the unit’s model, serial number and operating software on the card. When placed in the card reader on your computer, the Base Camp or HomePort recognizes the card and allows the HomePort to write the correct password to the card. When inserted in the GPS unit the unit is available to read the files on the card. I am not sure that either of these are available from their site for a Mac system. I suggest that you contact Garmin at 1-800-800-1020 for help in getting the system running on your Mac for that info.
Some Garmin Montana 610 come loaded with 100,000:1 topographical maps permanently installed in the unit. That unit is designated as 610t. The “t” is for topo maps. If so you can supplement these maps with a very derailed topo map by getting one of the additional mapping programs. The 24,000 shows much more detail mapping. The Garmin mapping program called TOPO US 24K Southeast has 24000:1 topographical maps that are really great. You can purchase these either as a download of on a memory card that fits your unit. That 24,000 topo set Includes coverage for Alabama, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, Puerto Rico, South Carolina, Tennessee, Virginia and West Virginia all in 24,000 scale topo.
Before laying out the money for those maps, see if the 100,000 scale maps will suit your needs if so forgo the 24,000 topos. Garmin also has ortho corrected aerial images of various areas. It is called BirdsEye. It is sold by regions in yearly subscriptions. It too is loaded from BaseCamp onto a spare memory card.
These and most all others are loaded onto a spare memory card which is inserted in the GPS unit. It must be in the unit in order to view the mapping images.
Unless otherwise specified, all positions are stated as Degrees, minutes and thousandths of minutes (DDD,MM.mmm) and were determined using WGS 84 Datum. All bearings and courses are stated in Magnetic degrees.
~ Captain Paul~