Radar Plotting Sheet TSD Scale

The TSD log scale from a radar plotting sheet can be taped to a clip board or chart table for convenient use with dividers. Fast quick good enough calculations can be done with just dividers to get vessel knots, days run, multiple days running and ETA.

GPS Back-up

The lightest travel freindly accurate kit to back-up GPS is a do it yourself mini Bris sextant combined with a 1 page Pub 249 sun long term almanac / 10' natural trig table and the back to the future Casio calculator watch CA - 53W. If there is extra room in the duffle bag then add a Davis MK 3 plastic sextant for completeness.

Bump Rechargeable Batteries

Rechargeable Bump lithium ion batteries are light weight, fast charging, x1000 charge cycles and leak proof. With circutry in the battery a 1.5 volt output is achieved so these batteries can power like Alkalines. Very pleased so far when using in AA and AAA applications in flashlights and shortwave radios.